21001250

素因数分解:

$2^1\times 5^4\times {\mathrm{53}}^1\times {\mathrm{317}}^1$

素因数の和:392

約数の個数: 40

約数和(自身を含む): 40233996

約数和(自身を除く): 19232746

約数列:

[1, 2, 5, 10, 25, 50, 53, 106, 125, 250, 265, 317, 530, 625, 634, 1250, 1325, 1585, 2650, 3170, 6625, 7925, 13250, 15850, 16801, 33125, 33602, 39625, 66250, 79250, 84005, 168010, 198125, 396250, 420025, 840050, 2100125, 4200250, 10500625, 21001250]

約数ペア:

[(1, 21001250), (2, 10500625), (5, 4200250), (10, 2100125), (25, 840050), (50, 420025), (53, 396250), (106, 198125), (125, 168010), (250, 84005), (265, 79250), (317, 66250), (530, 39625), (625, 33602), (634, 33125), (1250, 16801), (1325, 15850), (1585, 13250), (2650, 7925), (3170, 6625)]