20987140

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{359}}^1$

素因数の和:484

約数の個数: 48

約数和(自身を含む): 45964800

約数和(自身を除く): 24977660

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 79, 148, 158, 185, 316, 359, 370, 395, 718, 740, 790, 1436, 1580, 1795, 2923, 3590, 5846, 7180, 11692, 13283, 14615, 26566, 28361, 29230, 53132, 56722, 58460, 66415, 113444, 132830, 141805, 265660, 283610, 567220, 1049357, 2098714, 4197428, 5246785, 10493570, 20987140]

約数ペア:

[(1, 20987140), (2, 10493570), (4, 5246785), (5, 4197428), (10, 2098714), (20, 1049357), (37, 567220), (74, 283610), (79, 265660), (148, 141805), (158, 132830), (185, 113444), (316, 66415), (359, 58460), (370, 56722), (395, 53132), (718, 29230), (740, 28361), (790, 26566), (1436, 14615), (1580, 13283), (1795, 11692), (2923, 7180), (3590, 5846)]