19990920

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{61}}^1\times {\mathrm{2731}}^1$

素因数の和:2806

約数の個数: 64

約数和(自身を含む): 60978240

約数和(自身を除く): 40987320

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 61, 120, 122, 183, 244, 305, 366, 488, 610, 732, 915, 1220, 1464, 1830, 2440, 2731, 3660, 5462, 7320, 8193, 10924, 13655, 16386, 21848, 27310, 32772, 40965, 54620, 65544, 81930, 109240, 163860, 166591, 327720, 333182, 499773, 666364, 832955, 999546, 1332728, 1665910, 1999092, 2498865, 3331820, 3998184, 4997730, 6663640, 9995460, 19990920]

約数ペア:

[(1, 19990920), (2, 9995460), (3, 6663640), (4, 4997730), (5, 3998184), (6, 3331820), (8, 2498865), (10, 1999092), (12, 1665910), (15, 1332728), (20, 999546), (24, 832955), (30, 666364), (40, 499773), (60, 333182), (61, 327720), (120, 166591), (122, 163860), (183, 109240), (244, 81930), (305, 65544), (366, 54620), (488, 40965), (610, 32772), (732, 27310), (915, 21848), (1220, 16386), (1464, 13655), (1830, 10924), (2440, 8193), (2731, 7320), (3660, 5462)]