21248750

素因数分解:

$2^1\times 5^4\times {\mathrm{89}}^1\times {\mathrm{191}}^1$

素因数の和:302

約数の個数: 40

約数和(自身を含む): 40487040

約数和(自身を除く): 19238290

約数列:

[1, 2, 5, 10, 25, 50, 89, 125, 178, 191, 250, 382, 445, 625, 890, 955, 1250, 1910, 2225, 4450, 4775, 9550, 11125, 16999, 22250, 23875, 33998, 47750, 55625, 84995, 111250, 119375, 169990, 238750, 424975, 849950, 2124875, 4249750, 10624375, 21248750]

約数ペア:

[(1, 21248750), (2, 10624375), (5, 4249750), (10, 2124875), (25, 849950), (50, 424975), (89, 238750), (125, 169990), (178, 119375), (191, 111250), (250, 84995), (382, 55625), (445, 47750), (625, 33998), (890, 23875), (955, 22250), (1250, 16999), (1910, 11125), (2225, 9550), (4450, 4775)]