21379720

素因数分解:

$2^3\times 5^1\times {\mathrm{181}}^1\times {\mathrm{2953}}^1$

素因数の和:3145

約数の個数: 32

約数和(自身を含む): 48386520

約数和(自身を除く): 27006800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 181, 362, 724, 905, 1448, 1810, 2953, 3620, 5906, 7240, 11812, 14765, 23624, 29530, 59060, 118120, 534493, 1068986, 2137972, 2672465, 4275944, 5344930, 10689860, 21379720]

約数ペア:

[(1, 21379720), (2, 10689860), (4, 5344930), (5, 4275944), (8, 2672465), (10, 2137972), (20, 1068986), (40, 534493), (181, 118120), (362, 59060), (724, 29530), (905, 23624), (1448, 14765), (1810, 11812), (2953, 7240), (3620, 5906)]