21019615

素因数分解:

$5^1\times {\mathrm{101}}^1\times {\mathrm{107}}^1\times {\mathrm{389}}^1$

素因数の和:602

約数の個数: 16

約数和(自身を含む): 25777440

約数和(自身を除く): 4757825

約数列:

[1, 5, 101, 107, 389, 505, 535, 1945, 10807, 39289, 41623, 54035, 196445, 208115, 4203923, 21019615]

約数ペア:

[(1, 21019615), (5, 4203923), (101, 208115), (107, 196445), (389, 54035), (505, 41623), (535, 39289), (1945, 10807)]