21479625

素因数分解:

$3^2\times 5^3\times {\mathrm{61}}^1\times {\mathrm{313}}^1$

素因数の和:395

約数の個数: 48

約数和(自身を含む): 39481104

約数和(自身を除く): 18001479

約数列:

[1, 3, 5, 9, 15, 25, 45, 61, 75, 125, 183, 225, 305, 313, 375, 549, 915, 939, 1125, 1525, 1565, 2745, 2817, 4575, 4695, 7625, 7825, 13725, 14085, 19093, 22875, 23475, 39125, 57279, 68625, 70425, 95465, 117375, 171837, 286395, 352125, 477325, 859185, 1431975, 2386625, 4295925, 7159875, 21479625]

約数ペア:

[(1, 21479625), (3, 7159875), (5, 4295925), (9, 2386625), (15, 1431975), (25, 859185), (45, 477325), (61, 352125), (75, 286395), (125, 171837), (183, 117375), (225, 95465), (305, 70425), (313, 68625), (375, 57279), (549, 39125), (915, 23475), (939, 22875), (1125, 19093), (1525, 14085), (1565, 13725), (2745, 7825), (2817, 7625), (4575, 4695)]