21018915

素因数分解:

$3^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2371}}^1$

素因数の和:2579

約数の個数: 24

約数和(自身を含む): 36633168

約数和(自身を除く): 15614253

約数列:

[1, 3, 5, 9, 15, 45, 197, 591, 985, 1773, 2371, 2955, 7113, 8865, 11855, 21339, 35565, 106695, 467087, 1401261, 2335435, 4203783, 7006305, 21018915]

約数ペア:

[(1, 21018915), (3, 7006305), (5, 4203783), (9, 2335435), (15, 1401261), (45, 467087), (197, 106695), (591, 35565), (985, 21339), (1773, 11855), (2371, 8865), (2955, 7113)]