21871760

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{2087}}^1$

素因数の和:2231

約数の個数: 40

約数和(自身を含む): 51264576

約数和(自身を除く): 29392816

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 2087, 2096, 2620, 4174, 5240, 8348, 10435, 10480, 16696, 20870, 33392, 41740, 83480, 166960, 273397, 546794, 1093588, 1366985, 2187176, 2733970, 4374352, 5467940, 10935880, 21871760]

約数ペア:

[(1, 21871760), (2, 10935880), (4, 5467940), (5, 4374352), (8, 2733970), (10, 2187176), (16, 1366985), (20, 1093588), (40, 546794), (80, 273397), (131, 166960), (262, 83480), (524, 41740), (655, 33392), (1048, 20870), (1310, 16696), (2087, 10480), (2096, 10435), (2620, 8348), (4174, 5240)]