18990520

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1$

素因数の和:296

約数の個数: 64

約数和(自身を含む): 44684640

約数和(自身を除く): 25694120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 61, 86, 122, 172, 181, 215, 244, 305, 344, 362, 430, 488, 610, 724, 860, 905, 1220, 1448, 1720, 1810, 2440, 2623, 3620, 5246, 7240, 7783, 10492, 11041, 13115, 15566, 20984, 22082, 26230, 31132, 38915, 44164, 52460, 55205, 62264, 77830, 88328, 104920, 110410, 155660, 220820, 311320, 441640, 474763, 949526, 1899052, 2373815, 3798104, 4747630, 9495260, 18990520]

約数ペア:

[(1, 18990520), (2, 9495260), (4, 4747630), (5, 3798104), (8, 2373815), (10, 1899052), (20, 949526), (40, 474763), (43, 441640), (61, 311320), (86, 220820), (122, 155660), (172, 110410), (181, 104920), (215, 88328), (244, 77830), (305, 62264), (344, 55205), (362, 52460), (430, 44164), (488, 38915), (610, 31132), (724, 26230), (860, 22082), (905, 20984), (1220, 15566), (1448, 13115), (1720, 11041), (1810, 10492), (2440, 7783), (2623, 7240), (3620, 5246)]