639306880

素因数分解:

$2^7\times 5^1\times {\mathrm{998917}}^1$

素因数の和:998936

約数の個数: 32

約数和(自身を含む): 1528344540

約数和(自身を除く): 889037660

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 998917, 1997834, 3995668, 4994585, 7991336, 9989170, 15982672, 19978340, 31965344, 39956680, 63930688, 79913360, 127861376, 159826720, 319653440, 639306880]

約数ペア:

[(1, 639306880), (2, 319653440), (4, 159826720), (5, 127861376), (8, 79913360), (10, 63930688), (16, 39956680), (20, 31965344), (32, 19978340), (40, 15982672), (64, 9989170), (80, 7991336), (128, 4994585), (160, 3995668), (320, 1997834), (640, 998917)]