19981988

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{199}}^1\times {\mathrm{1931}}^1$

素因数の和:2147

約数の個数: 24

約数和(自身を含む): 37867200

約数和(自身を除く): 17885212

約数列:

[1, 2, 4, 13, 26, 52, 199, 398, 796, 1931, 2587, 3862, 5174, 7724, 10348, 25103, 50206, 100412, 384269, 768538, 1537076, 4995497, 9990994, 19981988]

約数ペア:

[(1, 19981988), (2, 9990994), (4, 4995497), (13, 1537076), (26, 768538), (52, 384269), (199, 100412), (398, 50206), (796, 25103), (1931, 10348), (2587, 7724), (3862, 5174)]