21481915

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1523}}^1$

素因数の和:1579

約数の個数: 32

約数和(自身を含む): 32772096

約数和(自身を除く): 11290181

約数列:

[1, 5, 7, 13, 31, 35, 65, 91, 155, 217, 403, 455, 1085, 1523, 2015, 2821, 7615, 10661, 14105, 19799, 47213, 53305, 98995, 138593, 236065, 330491, 613769, 692965, 1652455, 3068845, 4296383, 21481915]

約数ペア:

[(1, 21481915), (5, 4296383), (7, 3068845), (13, 1652455), (31, 692965), (35, 613769), (65, 330491), (91, 236065), (155, 138593), (217, 98995), (403, 53305), (455, 47213), (1085, 19799), (1523, 14105), (2015, 10661), (2821, 7615)]