21020240

素因数分解:

$2^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{2551}}^1$

素因数の和:2667

約数の個数: 40

約数和(自身を含む): 49365888

約数和(自身を除く): 28345648

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 103, 206, 412, 515, 824, 1030, 1648, 2060, 2551, 4120, 5102, 8240, 10204, 12755, 20408, 25510, 40816, 51020, 102040, 204080, 262753, 525506, 1051012, 1313765, 2102024, 2627530, 4204048, 5255060, 10510120, 21020240]

約数ペア:

[(1, 21020240), (2, 10510120), (4, 5255060), (5, 4204048), (8, 2627530), (10, 2102024), (16, 1313765), (20, 1051012), (40, 525506), (80, 262753), (103, 204080), (206, 102040), (412, 51020), (515, 40816), (824, 25510), (1030, 20408), (1648, 12755), (2060, 10204), (2551, 8240), (4120, 5102)]