639391360

素因数分解:

$2^7\times 5^1\times {\mathrm{999049}}^1$

素因数の和:999068

約数の個数: 32

約数和(自身を含む): 1528546500

約数和(自身を除く): 889155140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 999049, 1998098, 3996196, 4995245, 7992392, 9990490, 15984784, 19980980, 31969568, 39961960, 63939136, 79923920, 127878272, 159847840, 319695680, 639391360]

約数ペア:

[(1, 639391360), (2, 319695680), (4, 159847840), (5, 127878272), (8, 79923920), (10, 63939136), (16, 39961960), (20, 31969568), (32, 19980980), (40, 15984784), (64, 9990490), (80, 7992392), (128, 4995245), (160, 3996196), (320, 1998098), (640, 999049)]