20701280

素因数分解:

$2^5\times 5^1\times {\mathrm{109}}^1\times {\mathrm{1187}}^1$

素因数の和:1311

約数の個数: 48

約数和(自身を含む): 49397040

約数和(自身を除く): 28695760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 109, 160, 218, 436, 545, 872, 1090, 1187, 1744, 2180, 2374, 3488, 4360, 4748, 5935, 8720, 9496, 11870, 17440, 18992, 23740, 37984, 47480, 94960, 129383, 189920, 258766, 517532, 646915, 1035064, 1293830, 2070128, 2587660, 4140256, 5175320, 10350640, 20701280]

約数ペア:

[(1, 20701280), (2, 10350640), (4, 5175320), (5, 4140256), (8, 2587660), (10, 2070128), (16, 1293830), (20, 1035064), (32, 646915), (40, 517532), (80, 258766), (109, 189920), (160, 129383), (218, 94960), (436, 47480), (545, 37984), (872, 23740), (1090, 18992), (1187, 17440), (1744, 11870), (2180, 9496), (2374, 8720), (3488, 5935), (4360, 4748)]