21251565

素因数分解:

$3^5\times 5^1\times {\mathrm{17491}}^1$

素因数の和:17511

約数の個数: 24

約数和(自身を含む): 38202528

約数和(自身を除く): 16950963

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215, 17491, 52473, 87455, 157419, 262365, 472257, 787095, 1416771, 2361285, 4250313, 7083855, 21251565]

約数ペア:

[(1, 21251565), (3, 7083855), (5, 4250313), (9, 2361285), (15, 1416771), (27, 787095), (45, 472257), (81, 262365), (135, 157419), (243, 87455), (405, 52473), (1215, 17491)]