20872578560

素因数分解:

$2^9\times 5^1\times {\mathrm{821}}^1\times {\mathrm{9931}}^1$

素因数の和:10775

約数の個数: 80

約数和(自身を含む): 50111270352

約数和(自身を除く): 29238691792

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 821, 1280, 1642, 2560, 3284, 4105, 6568, 8210, 9931, 13136, 16420, 19862, 26272, 32840, 39724, 49655, 52544, 65680, 79448, 99310, 105088, 131360, 158896, 198620, 210176, 262720, 317792, 397240, 420352, 525440, 635584, 794480, 1050880, 1271168, 1588960, 2101760, 2542336, 3177920, 5084672, 6355840, 8153351, 12711680, 16306702, 25423360, 32613404, 40766755, 65226808, 81533510, 130453616, 163067020, 260907232, 326134040, 521814464, 652268080, 1043628928, 1304536160, 2087257856, 2609072320, 4174515712, 5218144640, 10436289280, 20872578560]

約数ペア:

[(1, 20872578560), (2, 10436289280), (4, 5218144640), (5, 4174515712), (8, 2609072320), (10, 2087257856), (16, 1304536160), (20, 1043628928), (32, 652268080), (40, 521814464), (64, 326134040), (80, 260907232), (128, 163067020), (160, 130453616), (256, 81533510), (320, 65226808), (512, 40766755), (640, 32613404), (821, 25423360), (1280, 16306702), (1642, 12711680), (2560, 8153351), (3284, 6355840), (4105, 5084672), (6568, 3177920), (8210, 2542336), (9931, 2101760), (13136, 1588960), (16420, 1271168), (19862, 1050880), (26272, 794480), (32840, 635584), (39724, 525440), (49655, 420352), (52544, 397240), (65680, 317792), (79448, 262720), (99310, 210176), (105088, 198620), (131360, 158896)]