21481980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{27541}}^1$

素因数の和:27566

約数の個数: 48

約数和(自身を含む): 64778784

約数和(自身を除く): 43296804

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 27541, 55082, 82623, 110164, 137705, 165246, 275410, 330492, 358033, 413115, 550820, 716066, 826230, 1074099, 1432132, 1652460, 1790165, 2148198, 3580330, 4296396, 5370495, 7160660, 10740990, 21481980]

約数ペア:

[(1, 21481980), (2, 10740990), (3, 7160660), (4, 5370495), (5, 4296396), (6, 3580330), (10, 2148198), (12, 1790165), (13, 1652460), (15, 1432132), (20, 1074099), (26, 826230), (30, 716066), (39, 550820), (52, 413115), (60, 358033), (65, 330492), (78, 275410), (130, 165246), (156, 137705), (195, 110164), (260, 82623), (390, 55082), (780, 27541)]