21272420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81817}}^1$

素因数の和:81839

約数の個数: 24

約数和(自身を含む): 48108984

約数和(自身を除く): 26836564

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81817, 163634, 327268, 409085, 818170, 1063621, 1636340, 2127242, 4254484, 5318105, 10636210, 21272420]

約数ペア:

[(1, 21272420), (2, 10636210), (4, 5318105), (5, 4254484), (10, 2127242), (13, 1636340), (20, 1063621), (26, 818170), (52, 409085), (65, 327268), (130, 163634), (260, 81817)]