21405872

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{103}}^1\times {\mathrm{419}}^1$

素因数の和:561

約数の個数: 40

約数和(自身を含む): 43330560

約数和(自身を除く): 21924688

約数列:

[1, 2, 4, 8, 16, 31, 62, 103, 124, 206, 248, 412, 419, 496, 824, 838, 1648, 1676, 3193, 3352, 6386, 6704, 12772, 12989, 25544, 25978, 43157, 51088, 51956, 86314, 103912, 172628, 207824, 345256, 690512, 1337867, 2675734, 5351468, 10702936, 21405872]

約数ペア:

[(1, 21405872), (2, 10702936), (4, 5351468), (8, 2675734), (16, 1337867), (31, 690512), (62, 345256), (103, 207824), (124, 172628), (206, 103912), (248, 86314), (412, 51956), (419, 51088), (496, 43157), (824, 25978), (838, 25544), (1648, 12989), (1676, 12772), (3193, 6704), (3352, 6386)]