21965840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{21121}}^1$

素因数の和:21147

約数の個数: 40

約数和(自身を含む): 55001688

約数和(自身を除く): 33035848

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 21121, 42242, 84484, 105605, 168968, 211210, 274573, 337936, 422420, 549146, 844840, 1098292, 1372865, 1689680, 2196584, 2745730, 4393168, 5491460, 10982920, 21965840]

約数ペア:

[(1, 21965840), (2, 10982920), (4, 5491460), (5, 4393168), (8, 2745730), (10, 2196584), (13, 1689680), (16, 1372865), (20, 1098292), (26, 844840), (40, 549146), (52, 422420), (65, 337936), (80, 274573), (104, 211210), (130, 168968), (208, 105605), (260, 84484), (520, 42242), (1040, 21121)]