21017960

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5417}}^1$

素因数の和:5525

約数の個数: 32

約数和(自身を含む): 47786760

約数和(自身を除く): 26768800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5417, 10834, 21668, 27085, 43336, 54170, 108340, 216680, 525449, 1050898, 2101796, 2627245, 4203592, 5254490, 10508980, 21017960]

約数ペア:

[(1, 21017960), (2, 10508980), (4, 5254490), (5, 4203592), (8, 2627245), (10, 2101796), (20, 1050898), (40, 525449), (97, 216680), (194, 108340), (388, 54170), (485, 43336), (776, 27085), (970, 21668), (1940, 10834), (3880, 5417)]