215891305

素因数分解:

$5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{9901}}^1$

素因数の和:10009

約数の個数: 24

約数和(自身を含む): 304783560

約数和(自身を除く): 88892255

約数列:

[1, 5, 7, 35, 49, 89, 245, 445, 623, 3115, 4361, 9901, 21805, 49505, 69307, 346535, 485149, 881189, 2425745, 4405945, 6168323, 30841615, 43178261, 215891305]

約数ペア:

[(1, 215891305), (5, 43178261), (7, 30841615), (35, 6168323), (49, 4405945), (89, 2425745), (245, 881189), (445, 485149), (623, 346535), (3115, 69307), (4361, 49505), (9901, 21805)]