21267220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{521}}^1$

素因数の和:700

約数の個数: 48

約数和(自身を含む): 48495888

約数和(自身を除く): 27228668

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 157, 260, 314, 521, 628, 785, 1042, 1570, 2041, 2084, 2605, 3140, 4082, 5210, 6773, 8164, 10205, 10420, 13546, 20410, 27092, 33865, 40820, 67730, 81797, 135460, 163594, 327188, 408985, 817970, 1063361, 1635940, 2126722, 4253444, 5316805, 10633610, 21267220]

約数ペア:

[(1, 21267220), (2, 10633610), (4, 5316805), (5, 4253444), (10, 2126722), (13, 1635940), (20, 1063361), (26, 817970), (52, 408985), (65, 327188), (130, 163594), (157, 135460), (260, 81797), (314, 67730), (521, 40820), (628, 33865), (785, 27092), (1042, 20410), (1570, 13546), (2041, 10420), (2084, 10205), (2605, 8164), (3140, 6773), (4082, 5210)]