21319888

素因数分解:

$2^4\times {\mathrm{79}}^1\times {\mathrm{101}}^1\times {\mathrm{167}}^1$

素因数の和:355

約数の個数: 40

約数和(自身を含む): 42497280

約数和(自身を除く): 21177392

約数列:

[1, 2, 4, 8, 16, 79, 101, 158, 167, 202, 316, 334, 404, 632, 668, 808, 1264, 1336, 1616, 2672, 7979, 13193, 15958, 16867, 26386, 31916, 33734, 52772, 63832, 67468, 105544, 127664, 134936, 211088, 269872, 1332493, 2664986, 5329972, 10659944, 21319888]

約数ペア:

[(1, 21319888), (2, 10659944), (4, 5329972), (8, 2664986), (16, 1332493), (79, 269872), (101, 211088), (158, 134936), (167, 127664), (202, 105544), (316, 67468), (334, 63832), (404, 52772), (632, 33734), (668, 31916), (808, 26386), (1264, 16867), (1336, 15958), (1616, 13193), (2672, 7979)]