20321960

素因数分解:

$2^3\times 5^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1\times {\mathrm{109}}^1$

素因数の和:258

約数の個数: 64

約数和(自身を含む): 47520000

約数和(自身を除く): 27198040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 59, 79, 109, 118, 158, 218, 236, 295, 316, 395, 436, 472, 545, 590, 632, 790, 872, 1090, 1180, 1580, 2180, 2360, 3160, 4360, 4661, 6431, 8611, 9322, 12862, 17222, 18644, 23305, 25724, 32155, 34444, 37288, 43055, 46610, 51448, 64310, 68888, 86110, 93220, 128620, 172220, 186440, 257240, 344440, 508049, 1016098, 2032196, 2540245, 4064392, 5080490, 10160980, 20321960]

約数ペア:

[(1, 20321960), (2, 10160980), (4, 5080490), (5, 4064392), (8, 2540245), (10, 2032196), (20, 1016098), (40, 508049), (59, 344440), (79, 257240), (109, 186440), (118, 172220), (158, 128620), (218, 93220), (236, 86110), (295, 68888), (316, 64310), (395, 51448), (436, 46610), (472, 43055), (545, 37288), (590, 34444), (632, 32155), (790, 25724), (872, 23305), (1090, 18644), (1180, 17222), (1580, 12862), (2180, 9322), (2360, 8611), (3160, 6431), (4360, 4661)]