21539780

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{12101}}^1$

素因数の和:12199

約数の個数: 24

約数和(自身を含む): 45745560

約数和(自身を除く): 24205780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 12101, 24202, 48404, 60505, 121010, 242020, 1076989, 2153978, 4307956, 5384945, 10769890, 21539780]

約数ペア:

[(1, 21539780), (2, 10769890), (4, 5384945), (5, 4307956), (10, 2153978), (20, 1076989), (89, 242020), (178, 121010), (356, 60505), (445, 48404), (890, 24202), (1780, 12101)]