21008920

素因数分解:

$2^3\times 5^1\times {\mathrm{659}}^1\times {\mathrm{797}}^1$

素因数の和:1467

約数の個数: 32

約数和(自身を含む): 47401200

約数和(自身を除く): 26392280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 659, 797, 1318, 1594, 2636, 3188, 3295, 3985, 5272, 6376, 6590, 7970, 13180, 15940, 26360, 31880, 525223, 1050446, 2100892, 2626115, 4201784, 5252230, 10504460, 21008920]

約数ペア:

[(1, 21008920), (2, 10504460), (4, 5252230), (5, 4201784), (8, 2626115), (10, 2100892), (20, 1050446), (40, 525223), (659, 31880), (797, 26360), (1318, 15940), (1594, 13180), (2636, 7970), (3188, 6590), (3295, 6376), (3985, 5272)]