21388439440

素因数分解:

$2^4\times 5^1\times {\mathrm{353}}^1\times {\mathrm{757381}}^1$

素因数の和:757747

約数の個数: 40

約数和(自身を含む): 49869060408

約数和(自身を除く): 28480620968

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 353, 706, 1412, 1765, 2824, 3530, 5648, 7060, 14120, 28240, 757381, 1514762, 3029524, 3786905, 6059048, 7573810, 12118096, 15147620, 30295240, 60590480, 267355493, 534710986, 1069421972, 1336777465, 2138843944, 2673554930, 4277687888, 5347109860, 10694219720, 21388439440]

約数ペア:

[(1, 21388439440), (2, 10694219720), (4, 5347109860), (5, 4277687888), (8, 2673554930), (10, 2138843944), (16, 1336777465), (20, 1069421972), (40, 534710986), (80, 267355493), (353, 60590480), (706, 30295240), (1412, 15147620), (1765, 12118096), (2824, 7573810), (3530, 6059048), (5648, 3786905), (7060, 3029524), (14120, 1514762), (28240, 757381)]