21007480

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{569}}^1$

素因数の和:664

約数の個数: 64

約数和(自身を含む): 51710400

約数和(自身を除く): 30702920

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 71, 104, 130, 142, 260, 284, 355, 520, 568, 569, 710, 923, 1138, 1420, 1846, 2276, 2840, 2845, 3692, 4552, 4615, 5690, 7384, 7397, 9230, 11380, 14794, 18460, 22760, 29588, 36920, 36985, 40399, 59176, 73970, 80798, 147940, 161596, 201995, 295880, 323192, 403990, 525187, 807980, 1050374, 1615960, 2100748, 2625935, 4201496, 5251870, 10503740, 21007480]

約数ペア:

[(1, 21007480), (2, 10503740), (4, 5251870), (5, 4201496), (8, 2625935), (10, 2100748), (13, 1615960), (20, 1050374), (26, 807980), (40, 525187), (52, 403990), (65, 323192), (71, 295880), (104, 201995), (130, 161596), (142, 147940), (260, 80798), (284, 73970), (355, 59176), (520, 40399), (568, 36985), (569, 36920), (710, 29588), (923, 22760), (1138, 18460), (1420, 14794), (1846, 11380), (2276, 9230), (2840, 7397), (2845, 7384), (3692, 5690), (4552, 4615)]