21538240

素因数分解:

$2^6\times 5^1\times {\mathrm{67307}}^1$

素因数の和:67324

約数の個数: 28

約数和(自身を含む): 51288696

約数和(自身を除く): 29750456

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 67307, 134614, 269228, 336535, 538456, 673070, 1076912, 1346140, 2153824, 2692280, 4307648, 5384560, 10769120, 21538240]

約数ペア:

[(1, 21538240), (2, 10769120), (4, 5384560), (5, 4307648), (8, 2692280), (10, 2153824), (16, 1346140), (20, 1076912), (32, 673070), (40, 538456), (64, 336535), (80, 269228), (160, 134614), (320, 67307)]