51781990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{398323}}^1$

素因数の和:398343

約数の個数: 16

約数和(自身を含む): 100377648

約数和(自身を除く): 48595658

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 398323, 796646, 1991615, 3983230, 5178199, 10356398, 25890995, 51781990]

約数ペア:

[(1, 51781990), (2, 25890995), (5, 10356398), (10, 5178199), (13, 3983230), (26, 1991615), (65, 796646), (130, 398323)]