20990120

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{9901}}^1$

素因数の和:9965

約数の個数: 32

約数和(自身を含む): 48123720

約数和(自身を除く): 27133600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 1060, 2120, 9901, 19802, 39604, 49505, 79208, 99010, 198020, 396040, 524753, 1049506, 2099012, 2623765, 4198024, 5247530, 10495060, 20990120]

約数ペア:

[(1, 20990120), (2, 10495060), (4, 5247530), (5, 4198024), (8, 2623765), (10, 2099012), (20, 1049506), (40, 524753), (53, 396040), (106, 198020), (212, 99010), (265, 79208), (424, 49505), (530, 39604), (1060, 19802), (2120, 9901)]