20557640

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{9697}}^1$

素因数の和:9761

約数の個数: 32

約数和(自身を含む): 47132280

約数和(自身を除く): 26574640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 1060, 2120, 9697, 19394, 38788, 48485, 77576, 96970, 193940, 387880, 513941, 1027882, 2055764, 2569705, 4111528, 5139410, 10278820, 20557640]

約数ペア:

[(1, 20557640), (2, 10278820), (4, 5139410), (5, 4111528), (8, 2569705), (10, 2055764), (20, 1027882), (40, 513941), (53, 387880), (106, 193940), (212, 96970), (265, 77576), (424, 48485), (530, 38788), (1060, 19394), (2120, 9697)]