21200020

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{2711}}^1$

素因数の和:2760

約数の個数: 48

約数和(自身を含む): 49206528

約数和(自身を除く): 28006508

約数列:

[1, 2, 4, 5, 10, 17, 20, 23, 34, 46, 68, 85, 92, 115, 170, 230, 340, 391, 460, 782, 1564, 1955, 2711, 3910, 5422, 7820, 10844, 13555, 27110, 46087, 54220, 62353, 92174, 124706, 184348, 230435, 249412, 311765, 460870, 623530, 921740, 1060001, 1247060, 2120002, 4240004, 5300005, 10600010, 21200020]

約数ペア:

[(1, 21200020), (2, 10600010), (4, 5300005), (5, 4240004), (10, 2120002), (17, 1247060), (20, 1060001), (23, 921740), (34, 623530), (46, 460870), (68, 311765), (85, 249412), (92, 230435), (115, 184348), (170, 124706), (230, 92174), (340, 62353), (391, 54220), (460, 46087), (782, 27110), (1564, 13555), (1955, 10844), (2711, 7820), (3910, 5422)]