21489080

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8807}}^1$

素因数の和:8879

約数の個数: 32

約数和(自身を含む): 49148640

約数和(自身を除く): 27659560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8807, 17614, 35228, 44035, 70456, 88070, 176140, 352280, 537227, 1074454, 2148908, 2686135, 4297816, 5372270, 10744540, 21489080]

約数ペア:

[(1, 21489080), (2, 10744540), (4, 5372270), (5, 4297816), (8, 2686135), (10, 2148908), (20, 1074454), (40, 537227), (61, 352280), (122, 176140), (244, 88070), (305, 70456), (488, 44035), (610, 35228), (1220, 17614), (2440, 8807)]