19781955

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^2\times {\mathrm{277}}^1$

素因数の和:337

約数の個数: 48

約数和(自身を含む): 36896160

約数和(自身を除く): 17114205

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 115, 135, 207, 277, 345, 529, 621, 831, 1035, 1385, 1587, 2493, 2645, 3105, 4155, 4761, 6371, 7479, 7935, 12465, 14283, 19113, 23805, 31855, 37395, 57339, 71415, 95565, 146533, 172017, 286695, 439599, 732665, 860085, 1318797, 2197995, 3956391, 6593985, 19781955]

約数ペア:

[(1, 19781955), (3, 6593985), (5, 3956391), (9, 2197995), (15, 1318797), (23, 860085), (27, 732665), (45, 439599), (69, 286695), (115, 172017), (135, 146533), (207, 95565), (277, 71415), (345, 57339), (529, 37395), (621, 31855), (831, 23805), (1035, 19113), (1385, 14283), (1587, 12465), (2493, 7935), (2645, 7479), (3105, 6371), (4155, 4761)]