21380840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41117}}^1$

素因数の和:41141

約数の個数: 32

約数和(自身を含む): 51808680

約数和(自身を除く): 30427840

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 41117, 82234, 164468, 205585, 328936, 411170, 534521, 822340, 1069042, 1644680, 2138084, 2672605, 4276168, 5345210, 10690420, 21380840]

約数ペア:

[(1, 21380840), (2, 10690420), (4, 5345210), (5, 4276168), (8, 2672605), (10, 2138084), (13, 1644680), (20, 1069042), (26, 822340), (40, 534521), (52, 411170), (65, 328936), (104, 205585), (130, 164468), (260, 82234), (520, 41117)]