20809540

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{461}}^1$

素因数の和:568

約数の個数: 48

約数和(自身を含む): 45715824

約数和(自身を除く): 24906284

約数列:

[1, 2, 4, 5, 10, 20, 37, 61, 74, 122, 148, 185, 244, 305, 370, 461, 610, 740, 922, 1220, 1844, 2257, 2305, 4514, 4610, 9028, 9220, 11285, 17057, 22570, 28121, 34114, 45140, 56242, 68228, 85285, 112484, 140605, 170570, 281210, 341140, 562420, 1040477, 2080954, 4161908, 5202385, 10404770, 20809540]

約数ペア:

[(1, 20809540), (2, 10404770), (4, 5202385), (5, 4161908), (10, 2080954), (20, 1040477), (37, 562420), (61, 341140), (74, 281210), (122, 170570), (148, 140605), (185, 112484), (244, 85285), (305, 68228), (370, 56242), (461, 45140), (610, 34114), (740, 28121), (922, 22570), (1220, 17057), (1844, 11285), (2257, 9220), (2305, 9028), (4514, 4610)]