21480890

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{27191}}^1$

素因数の和:27277

約数の個数: 16

約数和(自身を含む): 39156480

約数和(自身を除く): 17675590

約数列:

[1, 2, 5, 10, 79, 158, 395, 790, 27191, 54382, 135955, 271910, 2148089, 4296178, 10740445, 21480890]

約数ペア:

[(1, 21480890), (2, 10740445), (5, 4296178), (10, 2148089), (79, 271910), (158, 135955), (395, 54382), (790, 27191)]