21284879

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{241}}^1$

素因数の和:327

約数の個数: 32

約数和(自身を含む): 28250112

約数和(自身を除く): 6965233

約数列:

[1, 7, 11, 31, 37, 77, 217, 241, 259, 341, 407, 1147, 1687, 2387, 2651, 2849, 7471, 8029, 8917, 12617, 18557, 52297, 62419, 82181, 88319, 98087, 276427, 575267, 686609, 1934989, 3040697, 21284879]

約数ペア:

[(1, 21284879), (7, 3040697), (11, 1934989), (31, 686609), (37, 575267), (77, 276427), (217, 98087), (241, 88319), (259, 82181), (341, 62419), (407, 52297), (1147, 18557), (1687, 12617), (2387, 8917), (2651, 8029), (2849, 7471)]