20991070

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{72383}}^1$

素因数の和:72419

約数の個数: 16

約数和(自身を含む): 39087360

約数和(自身を除く): 18096290

約数列:

[1, 2, 5, 10, 29, 58, 145, 290, 72383, 144766, 361915, 723830, 2099107, 4198214, 10495535, 20991070]

約数ペア:

[(1, 20991070), (2, 10495535), (5, 4198214), (10, 2099107), (29, 723830), (58, 361915), (145, 144766), (290, 72383)]