21199720

素因数分解:

$2^3\times 5^1\times {\mathrm{149}}^1\times {\mathrm{3557}}^1$

素因数の和:3717

約数の個数: 32

約数和(自身を含む): 48033000

約数和(自身を除く): 26833280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 149, 298, 596, 745, 1192, 1490, 2980, 3557, 5960, 7114, 14228, 17785, 28456, 35570, 71140, 142280, 529993, 1059986, 2119972, 2649965, 4239944, 5299930, 10599860, 21199720]

約数ペア:

[(1, 21199720), (2, 10599860), (4, 5299930), (5, 4239944), (8, 2649965), (10, 2119972), (20, 1059986), (40, 529993), (149, 142280), (298, 71140), (596, 35570), (745, 28456), (1192, 17785), (1490, 14228), (2980, 7114), (3557, 5960)]