20181320

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1297}}^1$

素因数の和:1697

約数の個数: 32

約数和(自身を含む): 45559800

約数和(自身を除く): 25378480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1297, 1556, 1945, 2594, 3112, 3890, 5188, 6485, 7780, 10376, 12970, 15560, 25940, 51880, 504533, 1009066, 2018132, 2522665, 4036264, 5045330, 10090660, 20181320]

約数ペア:

[(1, 20181320), (2, 10090660), (4, 5045330), (5, 4036264), (8, 2522665), (10, 2018132), (20, 1009066), (40, 504533), (389, 51880), (778, 25940), (1297, 15560), (1556, 12970), (1945, 10376), (2594, 7780), (3112, 6485), (3890, 5188)]