19887920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1471}}^1$

素因数の和:1510

約数の個数: 60

約数和(自身を含む): 50103936

約数和(自身を除く): 30216016

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1471, 1690, 2704, 2942, 3380, 5884, 6760, 7355, 11768, 13520, 14710, 19123, 23536, 29420, 38246, 58840, 76492, 95615, 117680, 152984, 191230, 248599, 305968, 382460, 497198, 764920, 994396, 1242995, 1529840, 1988792, 2485990, 3977584, 4971980, 9943960, 19887920]

約数ペア:

[(1, 19887920), (2, 9943960), (4, 4971980), (5, 3977584), (8, 2485990), (10, 1988792), (13, 1529840), (16, 1242995), (20, 994396), (26, 764920), (40, 497198), (52, 382460), (65, 305968), (80, 248599), (104, 191230), (130, 152984), (169, 117680), (208, 95615), (260, 76492), (338, 58840), (520, 38246), (676, 29420), (845, 23536), (1040, 19123), (1352, 14710), (1471, 13520), (1690, 11768), (2704, 7355), (2942, 6760), (3380, 5884)]