20000.0000000

素因数分解:

$2^4\times 7^1\times {\mathrm{109}}^1\times {\mathrm{641}}^1$

素因数の和:765

約数の個数: 40

約数和(自身を含む): 17513760

約数和(自身を除く): 9688432

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 56, 109, 112, 218, 436, 641, 763, 872, 1282, 1526, 1744, 2564, 3052, 4487, 5128, 6104, 8974, 10256, 12208, 17948, 35896, 69869, 71792, 139738, 279476, 489083, 558952, 978166, 1117904, 1956332, 3912664, 7825328]

約数ペア:

[(1, 7825328), (2, 3912664), (4, 1956332), (7, 1117904), (8, 978166), (14, 558952), (16, 489083), (28, 279476), (56, 139738), (109, 71792), (112, 69869), (218, 35896), (436, 17948), (641, 12208), (763, 10256), (872, 8974), (1282, 6104), (1526, 5128), (1744, 4487), (2564, 3052)]