21902840

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{1051}}^1$

素因数の和:1583

約数の個数: 32

約数和(自身を含む): 49422960

約数和(自身を除く): 27520120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 1042, 1051, 2084, 2102, 2605, 4168, 4204, 5210, 5255, 8408, 10420, 10510, 20840, 21020, 42040, 547571, 1095142, 2190284, 2737855, 4380568, 5475710, 10951420, 21902840]

約数ペア:

[(1, 21902840), (2, 10951420), (4, 5475710), (5, 4380568), (8, 2737855), (10, 2190284), (20, 1095142), (40, 547571), (521, 42040), (1042, 21020), (1051, 20840), (2084, 10510), (2102, 10420), (2605, 8408), (4168, 5255), (4204, 5210)]