21513925

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{223}}^1\times {\mathrm{227}}^1$

素因数の和:477

約数の個数: 24

約数和(自身を含む): 28498176

約数和(自身を除く): 6984251

約数列:

[1, 5, 17, 25, 85, 223, 227, 425, 1115, 1135, 3791, 3859, 5575, 5675, 18955, 19295, 50621, 94775, 96475, 253105, 860557, 1265525, 4302785, 21513925]

約数ペア:

[(1, 21513925), (5, 4302785), (17, 1265525), (25, 860557), (85, 253105), (223, 96475), (227, 94775), (425, 50621), (1115, 19295), (1135, 18955), (3791, 5675), (3859, 5575)]