21005560

素因数分解:

$2^3\times 5^1\times {\mathrm{241}}^1\times {\mathrm{2179}}^1$

素因数の和:2431

約数の個数: 32

約数和(自身を含む): 47480400

約数和(自身を除く): 26474840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 241, 482, 964, 1205, 1928, 2179, 2410, 4358, 4820, 8716, 9640, 10895, 17432, 21790, 43580, 87160, 525139, 1050278, 2100556, 2625695, 4201112, 5251390, 10502780, 21005560]

約数ペア:

[(1, 21005560), (2, 10502780), (4, 5251390), (5, 4201112), (8, 2625695), (10, 2100556), (20, 1050278), (40, 525139), (241, 87160), (482, 43580), (964, 21790), (1205, 17432), (1928, 10895), (2179, 9640), (2410, 8716), (4358, 4820)]