20781840

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{131}}^1\times {\mathrm{661}}^1$

素因数の和:808

約数の個数: 80

約数和(自身を含む): 65013696

約数和(自身を除く): 44231856

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 131, 240, 262, 393, 524, 655, 661, 786, 1048, 1310, 1322, 1572, 1965, 1983, 2096, 2620, 2644, 3144, 3305, 3930, 3966, 5240, 5288, 6288, 6610, 7860, 7932, 9915, 10480, 10576, 13220, 15720, 15864, 19830, 26440, 31440, 31728, 39660, 52880, 79320, 86591, 158640, 173182, 259773, 346364, 432955, 519546, 692728, 865910, 1039092, 1298865, 1385456, 1731820, 2078184, 2597730, 3463640, 4156368, 5195460, 6927280, 10390920, 20781840]

約数ペア:

[(1, 20781840), (2, 10390920), (3, 6927280), (4, 5195460), (5, 4156368), (6, 3463640), (8, 2597730), (10, 2078184), (12, 1731820), (15, 1385456), (16, 1298865), (20, 1039092), (24, 865910), (30, 692728), (40, 519546), (48, 432955), (60, 346364), (80, 259773), (120, 173182), (131, 158640), (240, 86591), (262, 79320), (393, 52880), (524, 39660), (655, 31728), (661, 31440), (786, 26440), (1048, 19830), (1310, 15864), (1322, 15720), (1572, 13220), (1965, 10576), (1983, 10480), (2096, 9915), (2620, 7932), (2644, 7860), (3144, 6610), (3305, 6288), (3930, 5288), (3966, 5240)]