81339980

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{51481}}^1$

素因数の和:51569

約数の個数: 24

約数和(自身を含む): 172979520

約数和(自身を除く): 91639540

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 51481, 102962, 205924, 257405, 514810, 1029620, 4066999, 8133998, 16267996, 20334995, 40669990, 81339980]

約数ペア:

[(1, 81339980), (2, 40669990), (4, 20334995), (5, 16267996), (10, 8133998), (20, 4066999), (79, 1029620), (158, 514810), (316, 257405), (395, 205924), (790, 102962), (1580, 51481)]