199901990

素因数分解:

$2^1\times 5^1\times {\mathrm{239}}^1\times {\mathrm{83641}}^1$

素因数の和:83887

約数の個数: 16

約数和(自身を含む): 361333440

約数和(自身を除く): 161431450

約数列:

[1, 2, 5, 10, 239, 478, 1195, 2390, 83641, 167282, 418205, 836410, 19990199, 39980398, 99950995, 199901990]

約数ペア:

[(1, 199901990), (2, 99950995), (5, 39980398), (10, 19990199), (239, 836410), (478, 418205), (1195, 167282), (2390, 83641)]