21238040

素因数分解:

$2^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{6397}}^1$

素因数の和:6491

約数の個数: 32

約数和(自身を含む): 48368880

約数和(自身を除く): 27130840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 83, 166, 332, 415, 664, 830, 1660, 3320, 6397, 12794, 25588, 31985, 51176, 63970, 127940, 255880, 530951, 1061902, 2123804, 2654755, 4247608, 5309510, 10619020, 21238040]

約数ペア:

[(1, 21238040), (2, 10619020), (4, 5309510), (5, 4247608), (8, 2654755), (10, 2123804), (20, 1061902), (40, 530951), (83, 255880), (166, 127940), (332, 63970), (415, 51176), (664, 31985), (830, 25588), (1660, 12794), (3320, 6397)]