21531780

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1$

素因数の和:166

約数の個数: 144

約数和(自身を含む): 69464304

約数和(自身を除く): 47932524

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 37, 45, 53, 60, 61, 74, 90, 106, 111, 122, 148, 159, 180, 183, 185, 212, 222, 244, 265, 305, 318, 333, 366, 370, 444, 477, 530, 549, 555, 610, 636, 666, 732, 740, 795, 915, 954, 1060, 1098, 1110, 1220, 1332, 1590, 1665, 1830, 1908, 1961, 2196, 2220, 2257, 2385, 2745, 3180, 3233, 3330, 3660, 3922, 4514, 4770, 5490, 5883, 6466, 6660, 6771, 7844, 9028, 9540, 9699, 9805, 10980, 11285, 11766, 12932, 13542, 16165, 17649, 19398, 19610, 20313, 22570, 23532, 27084, 29097, 29415, 32330, 33855, 35298, 38796, 39220, 40626, 45140, 48495, 58194, 58830, 64660, 67710, 70596, 81252, 88245, 96990, 101565, 116388, 117660, 119621, 135420, 145485, 176490, 193980, 203130, 239242, 290970, 352980, 358863, 406260, 478484, 581940, 598105, 717726, 1076589, 1196210, 1435452, 1794315, 2153178, 2392420, 3588630, 4306356, 5382945, 7177260, 10765890, 21531780]

約数ペア:

[(1, 21531780), (2, 10765890), (3, 7177260), (4, 5382945), (5, 4306356), (6, 3588630), (9, 2392420), (10, 2153178), (12, 1794315), (15, 1435452), (18, 1196210), (20, 1076589), (30, 717726), (36, 598105), (37, 581940), (45, 478484), (53, 406260), (60, 358863), (61, 352980), (74, 290970), (90, 239242), (106, 203130), (111, 193980), (122, 176490), (148, 145485), (159, 135420), (180, 119621), (183, 117660), (185, 116388), (212, 101565), (222, 96990), (244, 88245), (265, 81252), (305, 70596), (318, 67710), (333, 64660), (366, 58830), (370, 58194), (444, 48495), (477, 45140), (530, 40626), (549, 39220), (555, 38796), (610, 35298), (636, 33855), (666, 32330), (732, 29415), (740, 29097), (795, 27084), (915, 23532), (954, 22570), (1060, 20313), (1098, 19610), (1110, 19398), (1220, 17649), (1332, 16165), (1590, 13542), (1665, 12932), (1830, 11766), (1908, 11285), (1961, 10980), (2196, 9805), (2220, 9699), (2257, 9540), (2385, 9028), (2745, 7844), (3180, 6771), (3233, 6660), (3330, 6466), (3660, 5883), (3922, 5490), (4514, 4770)]