21072280

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5431}}^1$

素因数の和:5539

約数の個数: 32

約数和(自身を含む): 47910240

約数和(自身を除く): 26837960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5431, 10862, 21724, 27155, 43448, 54310, 108620, 217240, 526807, 1053614, 2107228, 2634035, 4214456, 5268070, 10536140, 21072280]

約数ペア:

[(1, 21072280), (2, 10536140), (4, 5268070), (5, 4214456), (8, 2634035), (10, 2107228), (20, 1053614), (40, 526807), (97, 217240), (194, 108620), (388, 54310), (485, 43448), (776, 27155), (970, 21724), (1940, 10862), (3880, 5431)]