21499984

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{151}}^1\times {\mathrm{809}}^1$

素因数の和:979

約数の個数: 40

約数和(自身を含む): 45800640

約数和(自身を除く): 24300656

約数列:

[1, 2, 4, 8, 11, 16, 22, 44, 88, 151, 176, 302, 604, 809, 1208, 1618, 1661, 2416, 3236, 3322, 6472, 6644, 8899, 12944, 13288, 17798, 26576, 35596, 71192, 122159, 142384, 244318, 488636, 977272, 1343749, 1954544, 2687498, 5374996, 10749992, 21499984]

約数ペア:

[(1, 21499984), (2, 10749992), (4, 5374996), (8, 2687498), (11, 1954544), (16, 1343749), (22, 977272), (44, 488636), (88, 244318), (151, 142384), (176, 122159), (302, 71192), (604, 35596), (809, 26576), (1208, 17798), (1618, 13288), (1661, 12944), (2416, 8899), (3236, 6644), (3322, 6472)]