21517975

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{509}}^1$

素因数の和:627

約数の個数: 24

約数和(自身を含む): 28458000

約数和(自身を除く): 6940025

約数列:

[1, 5, 19, 25, 89, 95, 445, 475, 509, 1691, 2225, 2545, 8455, 9671, 12725, 42275, 45301, 48355, 226505, 241775, 860719, 1132525, 4303595, 21517975]

約数ペア:

[(1, 21517975), (5, 4303595), (19, 1132525), (25, 860719), (89, 241775), (95, 226505), (445, 48355), (475, 45301), (509, 42275), (1691, 12725), (2225, 9671), (2545, 8455)]