409887920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{394123}}^1$

素因数の和:394149

約数の個数: 40

約数和(自身を含む): 1026298896

約数和(自身を除く): 616410976

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 394123, 788246, 1576492, 1970615, 3152984, 3941230, 5123599, 6305968, 7882460, 10247198, 15764920, 20494396, 25617995, 31529840, 40988792, 51235990, 81977584, 102471980, 204943960, 409887920]

約数ペア:

[(1, 409887920), (2, 204943960), (4, 102471980), (5, 81977584), (8, 51235990), (10, 40988792), (13, 31529840), (16, 25617995), (20, 20494396), (26, 15764920), (40, 10247198), (52, 7882460), (65, 6305968), (80, 5123599), (104, 3941230), (130, 3152984), (208, 1970615), (260, 1576492), (520, 788246), (1040, 394123)]