21521320

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31649}}^1$

素因数の和:31677

約数の個数: 32

約数和(自身を含む): 51273000

約数和(自身を除く): 29751680

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31649, 63298, 126596, 158245, 253192, 316490, 538033, 632980, 1076066, 1265960, 2152132, 2690165, 4304264, 5380330, 10760660, 21521320]

約数ペア:

[(1, 21521320), (2, 10760660), (4, 5380330), (5, 4304264), (8, 2690165), (10, 2152132), (17, 1265960), (20, 1076066), (34, 632980), (40, 538033), (68, 316490), (85, 253192), (136, 158245), (170, 126596), (340, 63298), (680, 31649)]