81807980

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{40499}}^1$

素因数の和:40609

約数の個数: 24

約数和(自身を含む): 173502000

約数和(自身を除く): 91694020

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 40499, 80998, 161996, 202495, 404990, 809980, 4090399, 8180798, 16361596, 20451995, 40903990, 81807980]

約数ペア:

[(1, 81807980), (2, 40903990), (4, 20451995), (5, 16361596), (10, 8180798), (20, 4090399), (101, 809980), (202, 404990), (404, 202495), (505, 161996), (1010, 80998), (2020, 40499)]