21278660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{223}}^1\times {\mathrm{367}}^1$

素因数の和:612

約数の個数: 48

約数和(自身を含む): 48470016

約数和(自身を除く): 27191356

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 223, 260, 367, 446, 734, 892, 1115, 1468, 1835, 2230, 2899, 3670, 4460, 4771, 5798, 7340, 9542, 11596, 14495, 19084, 23855, 28990, 47710, 57980, 81841, 95420, 163682, 327364, 409205, 818410, 1063933, 1636820, 2127866, 4255732, 5319665, 10639330, 21278660]

約数ペア:

[(1, 21278660), (2, 10639330), (4, 5319665), (5, 4255732), (10, 2127866), (13, 1636820), (20, 1063933), (26, 818410), (52, 409205), (65, 327364), (130, 163682), (223, 95420), (260, 81841), (367, 57980), (446, 47710), (734, 28990), (892, 23855), (1115, 19084), (1468, 14495), (1835, 11596), (2230, 9542), (2899, 7340), (3670, 5798), (4460, 4771)]