20790640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19991}}^1$

素因数の和:20017

約数の個数: 40

約数和(自身を含む): 52059168

約数和(自身を除く): 31268528

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19991, 39982, 79964, 99955, 159928, 199910, 259883, 319856, 399820, 519766, 799640, 1039532, 1299415, 1599280, 2079064, 2598830, 4158128, 5197660, 10395320, 20790640]

約数ペア:

[(1, 20790640), (2, 10395320), (4, 5197660), (5, 4158128), (8, 2598830), (10, 2079064), (13, 1599280), (16, 1299415), (20, 1039532), (26, 799640), (40, 519766), (52, 399820), (65, 319856), (80, 259883), (104, 199910), (130, 159928), (208, 99955), (260, 79964), (520, 39982), (1040, 19991)]