1640642000

素因数分解:

$2^4\times 5^3\times {\mathrm{820321}}^1$

素因数の和:820344

約数の個数: 40

約数和(自身を含む): 3967077192

約数和(自身を除く): 2326435192

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 2000, 820321, 1640642, 3281284, 4101605, 6562568, 8203210, 13125136, 16406420, 20508025, 32812840, 41016050, 65625680, 82032100, 102540125, 164064200, 205080250, 328128400, 410160500, 820321000, 1640642000]

約数ペア:

[(1, 1640642000), (2, 820321000), (4, 410160500), (5, 328128400), (8, 205080250), (10, 164064200), (16, 102540125), (20, 82032100), (25, 65625680), (40, 41016050), (50, 32812840), (80, 20508025), (100, 16406420), (125, 13125136), (200, 8203210), (250, 6562568), (400, 4101605), (500, 3281284), (1000, 1640642), (2000, 820321)]