21399640

素因数分解:

$2^3\times 5^1\times {\mathrm{191}}^1\times {\mathrm{2801}}^1$

素因数の和:3003

約数の個数: 32

約数和(自身を含む): 48418560

約数和(自身を除く): 27018920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 191, 382, 764, 955, 1528, 1910, 2801, 3820, 5602, 7640, 11204, 14005, 22408, 28010, 56020, 112040, 534991, 1069982, 2139964, 2674955, 4279928, 5349910, 10699820, 21399640]

約数ペア:

[(1, 21399640), (2, 10699820), (4, 5349910), (5, 4279928), (8, 2674955), (10, 2139964), (20, 1069982), (40, 534991), (191, 112040), (382, 56020), (764, 28010), (955, 22408), (1528, 14005), (1910, 11204), (2801, 7640), (3820, 5602)]