21790640

素因数分解:

$2^4\times 5^1\times {\mathrm{272383}}^1$

素因数の和:272396

約数の個数: 20

約数和(自身を含む): 50663424

約数和(自身を除く): 28872784

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272383, 544766, 1089532, 1361915, 2179064, 2723830, 4358128, 5447660, 10895320, 21790640]

約数ペア:

[(1, 21790640), (2, 10895320), (4, 5447660), (5, 4358128), (8, 2723830), (10, 2179064), (16, 1361915), (20, 1089532), (40, 544766), (80, 272383)]