21007900

素因数分解:

$2^2\times 5^2\times {\mathrm{421}}^1\times {\mathrm{499}}^1$

素因数の和:934

約数の個数: 36

約数和(自身を含む): 45787000

約数和(自身を除く): 24779100

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 421, 499, 842, 998, 1684, 1996, 2105, 2495, 4210, 4990, 8420, 9980, 10525, 12475, 21050, 24950, 42100, 49900, 210079, 420158, 840316, 1050395, 2100790, 4201580, 5251975, 10503950, 21007900]

約数ペア:

[(1, 21007900), (2, 10503950), (4, 5251975), (5, 4201580), (10, 2100790), (20, 1050395), (25, 840316), (50, 420158), (100, 210079), (421, 49900), (499, 42100), (842, 24950), (998, 21050), (1684, 12475), (1996, 10525), (2105, 9980), (2495, 8420), (4210, 4990)]