21021820

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{17231}}^1$

素因数の和:17301

約数の個数: 24

約数和(自身を含む): 44872128

約数和(自身を除く): 23850308

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 17231, 34462, 68924, 86155, 172310, 344620, 1051091, 2102182, 4204364, 5255455, 10510910, 21021820]

約数ペア:

[(1, 21021820), (2, 10510910), (4, 5255455), (5, 4204364), (10, 2102182), (20, 1051091), (61, 344620), (122, 172310), (244, 86155), (305, 68924), (610, 34462), (1220, 17231)]