20945990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{161123}}^1$

素因数の和:161143

約数の個数: 16

約数和(自身を含む): 40603248

約数和(自身を除く): 19657258

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 161123, 322246, 805615, 1611230, 2094599, 4189198, 10472995, 20945990]

約数ペア:

[(1, 20945990), (2, 10472995), (5, 4189198), (10, 2094599), (13, 1611230), (26, 805615), (65, 322246), (130, 161123)]