21256380

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{269}}^1\times {\mathrm{439}}^1$

素因数の和:723

約数の個数: 72

約数和(自身を含む): 64864800

約数和(自身を除く): 43608420

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 269, 439, 538, 807, 878, 1076, 1317, 1345, 1614, 1756, 2195, 2421, 2634, 2690, 3228, 3951, 4035, 4390, 4842, 5268, 5380, 6585, 7902, 8070, 8780, 9684, 12105, 13170, 15804, 16140, 19755, 24210, 26340, 39510, 48420, 79020, 118091, 236182, 354273, 472364, 590455, 708546, 1062819, 1180910, 1417092, 1771365, 2125638, 2361820, 3542730, 4251276, 5314095, 7085460, 10628190, 21256380]

約数ペア:

[(1, 21256380), (2, 10628190), (3, 7085460), (4, 5314095), (5, 4251276), (6, 3542730), (9, 2361820), (10, 2125638), (12, 1771365), (15, 1417092), (18, 1180910), (20, 1062819), (30, 708546), (36, 590455), (45, 472364), (60, 354273), (90, 236182), (180, 118091), (269, 79020), (439, 48420), (538, 39510), (807, 26340), (878, 24210), (1076, 19755), (1317, 16140), (1345, 15804), (1614, 13170), (1756, 12105), (2195, 9684), (2421, 8780), (2634, 8070), (2690, 7902), (3228, 6585), (3951, 5380), (4035, 5268), (4390, 4842)]