21820359

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:291

約数の個数: 32

約数和(自身を含む): 32901120

約数和(自身を除く): 11080761

約数列:

[1, 3, 11, 33, 67, 71, 139, 201, 213, 417, 737, 781, 1529, 2211, 2343, 4587, 4757, 9313, 9869, 14271, 27939, 29607, 52327, 102443, 108559, 156981, 307329, 325677, 661223, 1983669, 7273453, 21820359]

約数ペア:

[(1, 21820359), (3, 7273453), (11, 1983669), (33, 661223), (67, 325677), (71, 307329), (139, 156981), (201, 108559), (213, 102443), (417, 52327), (737, 29607), (781, 27939), (1529, 14271), (2211, 9869), (2343, 9313), (4587, 4757)]