21857720

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{6917}}^1$

素因数の和:7007

約数の個数: 32

約数和(自身を含む): 49809600

約数和(自身を除く): 27951880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 6917, 13834, 27668, 34585, 55336, 69170, 138340, 276680, 546443, 1092886, 2185772, 2732215, 4371544, 5464430, 10928860, 21857720]

約数ペア:

[(1, 21857720), (2, 10928860), (4, 5464430), (5, 4371544), (8, 2732215), (10, 2185772), (20, 1092886), (40, 546443), (79, 276680), (158, 138340), (316, 69170), (395, 55336), (632, 34585), (790, 27668), (1580, 13834), (3160, 6917)]