21457360

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4397}}^1$

素因数の和:4471

約数の個数: 40

約数和(自身を含む): 50717736

約数和(自身を除く): 29260376

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4397, 4880, 8794, 17588, 21985, 35176, 43970, 70352, 87940, 175880, 268217, 351760, 536434, 1072868, 1341085, 2145736, 2682170, 4291472, 5364340, 10728680, 21457360]

約数ペア:

[(1, 21457360), (2, 10728680), (4, 5364340), (5, 4291472), (8, 2682170), (10, 2145736), (16, 1341085), (20, 1072868), (40, 536434), (61, 351760), (80, 268217), (122, 175880), (244, 87940), (305, 70352), (488, 43970), (610, 35176), (976, 21985), (1220, 17588), (2440, 8794), (4397, 4880)]