21105603

素因数分解:

$3^4\times {\mathrm{67}}^1\times {\mathrm{3889}}^1$

素因数の和:3968

約数の個数: 20

約数和(自身を含む): 32006920

約数和(自身を除く): 10901317

約数列:

[1, 3, 9, 27, 67, 81, 201, 603, 1809, 3889, 5427, 11667, 35001, 105003, 260563, 315009, 781689, 2345067, 7035201, 21105603]

約数ペア:

[(1, 21105603), (3, 7035201), (9, 2345067), (27, 781689), (67, 315009), (81, 260563), (201, 105003), (603, 35001), (1809, 11667), (3889, 5427)]