20705020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2083}}^1$

素因数の和:2170

約数の個数: 48

約数和(自身を含む): 50416128

約数和(自身を除く): 29711108

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2083, 2485, 4166, 4970, 8332, 9940, 10415, 14581, 20830, 29162, 41660, 58324, 72905, 145810, 147893, 291620, 295786, 591572, 739465, 1035251, 1478930, 2070502, 2957860, 4141004, 5176255, 10352510, 20705020]

約数ペア:

[(1, 20705020), (2, 10352510), (4, 5176255), (5, 4141004), (7, 2957860), (10, 2070502), (14, 1478930), (20, 1035251), (28, 739465), (35, 591572), (70, 295786), (71, 291620), (140, 147893), (142, 145810), (284, 72905), (355, 58324), (497, 41660), (710, 29162), (994, 20830), (1420, 14581), (1988, 10415), (2083, 9940), (2485, 8332), (4166, 4970)]