51254360

素因数分解:

$2^3\times 5^1\times {\mathrm{641}}^1\times {\mathrm{1999}}^1$

素因数の和:2651

約数の個数: 32

約数和(自身を含む): 115560000

約数和(自身を除く): 64305640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 641, 1282, 1999, 2564, 3205, 3998, 5128, 6410, 7996, 9995, 12820, 15992, 19990, 25640, 39980, 79960, 1281359, 2562718, 5125436, 6406795, 10250872, 12813590, 25627180, 51254360]

約数ペア:

[(1, 51254360), (2, 25627180), (4, 12813590), (5, 10250872), (8, 6406795), (10, 5125436), (20, 2562718), (40, 1281359), (641, 79960), (1282, 39980), (1999, 25640), (2564, 19990), (3205, 15992), (3998, 12820), (5128, 9995), (6410, 7996)]