20987900

素因数分解:

$2^2\times 5^2\times {\mathrm{41}}^1\times {\mathrm{5119}}^1$

素因数の和:5174

約数の個数: 36

約数和(自身を含む): 46663680

約数和(自身を除く): 25675780

約数列:

[1, 2, 4, 5, 10, 20, 25, 41, 50, 82, 100, 164, 205, 410, 820, 1025, 2050, 4100, 5119, 10238, 20476, 25595, 51190, 102380, 127975, 209879, 255950, 419758, 511900, 839516, 1049395, 2098790, 4197580, 5246975, 10493950, 20987900]

約数ペア:

[(1, 20987900), (2, 10493950), (4, 5246975), (5, 4197580), (10, 2098790), (20, 1049395), (25, 839516), (41, 511900), (50, 419758), (82, 255950), (100, 209879), (164, 127975), (205, 102380), (410, 51190), (820, 25595), (1025, 20476), (2050, 10238), (4100, 5119)]