21261320

素因数分解:

$2^3\times 5^1\times {\mathrm{461}}^1\times {\mathrm{1153}}^1$

素因数の和:1625

約数の個数: 32

約数和(自身を含む): 47983320

約数和(自身を除く): 26722000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 461, 922, 1153, 1844, 2305, 2306, 3688, 4610, 4612, 5765, 9220, 9224, 11530, 18440, 23060, 46120, 531533, 1063066, 2126132, 2657665, 4252264, 5315330, 10630660, 21261320]

約数ペア:

[(1, 21261320), (2, 10630660), (4, 5315330), (5, 4252264), (8, 2657665), (10, 2126132), (20, 1063066), (40, 531533), (461, 46120), (922, 23060), (1153, 18440), (1844, 11530), (2305, 9224), (2306, 9220), (3688, 5765), (4610, 4612)]