20018560

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1009}}^1$

素因数の和:1059

約数の個数: 64

約数和(自身を含む): 49449600

約数和(自身を除く): 29431040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1009, 1240, 1984, 2018, 2480, 3968, 4036, 4960, 5045, 8072, 9920, 10090, 16144, 19840, 20180, 31279, 32288, 40360, 62558, 64576, 80720, 125116, 129152, 156395, 161440, 250232, 312790, 322880, 500464, 625580, 645760, 1000928, 1251160, 2001856, 2502320, 4003712, 5004640, 10009280, 20018560]

約数ペア:

[(1, 20018560), (2, 10009280), (4, 5004640), (5, 4003712), (8, 2502320), (10, 2001856), (16, 1251160), (20, 1000928), (31, 645760), (32, 625580), (40, 500464), (62, 322880), (64, 312790), (80, 250232), (124, 161440), (128, 156395), (155, 129152), (160, 125116), (248, 80720), (310, 64576), (320, 62558), (496, 40360), (620, 32288), (640, 31279), (992, 20180), (1009, 19840), (1240, 16144), (1984, 10090), (2018, 9920), (2480, 8072), (3968, 5045), (4036, 4960)]