21507831

素因数分解:

$3^2\times {\mathrm{31}}^1\times {\mathrm{127}}^1\times {\mathrm{607}}^1$

素因数の和:771

約数の個数: 24

約数和(自身を含む): 32374784

約数和(自身を除く): 10866953

約数列:

[1, 3, 9, 31, 93, 127, 279, 381, 607, 1143, 1821, 3937, 5463, 11811, 18817, 35433, 56451, 77089, 169353, 231267, 693801, 2389759, 7169277, 21507831]

約数ペア:

[(1, 21507831), (3, 7169277), (9, 2389759), (31, 693801), (93, 231267), (127, 169353), (279, 77089), (381, 56451), (607, 35433), (1143, 18817), (1821, 11811), (3937, 5463)]