20820520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1$

素因数の和:155

約数の個数: 128

約数和(自身を含む): 57853440

約数和(自身を除く): 37032920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 23, 28, 35, 40, 46, 53, 56, 61, 70, 92, 106, 115, 122, 140, 161, 184, 212, 230, 244, 265, 280, 305, 322, 371, 424, 427, 460, 488, 530, 610, 644, 742, 805, 854, 920, 1060, 1219, 1220, 1288, 1403, 1484, 1610, 1708, 1855, 2120, 2135, 2438, 2440, 2806, 2968, 3220, 3233, 3416, 3710, 4270, 4876, 5612, 6095, 6440, 6466, 7015, 7420, 8533, 8540, 9752, 9821, 11224, 12190, 12932, 14030, 14840, 16165, 17066, 17080, 19642, 22631, 24380, 25864, 28060, 32330, 34132, 39284, 42665, 45262, 48760, 49105, 56120, 64660, 68264, 74359, 78568, 85330, 90524, 98210, 113155, 129320, 148718, 170660, 181048, 196420, 226310, 297436, 341320, 371795, 392840, 452620, 520513, 594872, 743590, 905240, 1041026, 1487180, 2082052, 2602565, 2974360, 4164104, 5205130, 10410260, 20820520]

約数ペア:

[(1, 20820520), (2, 10410260), (4, 5205130), (5, 4164104), (7, 2974360), (8, 2602565), (10, 2082052), (14, 1487180), (20, 1041026), (23, 905240), (28, 743590), (35, 594872), (40, 520513), (46, 452620), (53, 392840), (56, 371795), (61, 341320), (70, 297436), (92, 226310), (106, 196420), (115, 181048), (122, 170660), (140, 148718), (161, 129320), (184, 113155), (212, 98210), (230, 90524), (244, 85330), (265, 78568), (280, 74359), (305, 68264), (322, 64660), (371, 56120), (424, 49105), (427, 48760), (460, 45262), (488, 42665), (530, 39284), (610, 34132), (644, 32330), (742, 28060), (805, 25864), (854, 24380), (920, 22631), (1060, 19642), (1219, 17080), (1220, 17066), (1288, 16165), (1403, 14840), (1484, 14030), (1610, 12932), (1708, 12190), (1855, 11224), (2120, 9821), (2135, 9752), (2438, 8540), (2440, 8533), (2806, 7420), (2968, 7015), (3220, 6466), (3233, 6440), (3416, 6095), (3710, 5612), (4270, 4876)]