28218879

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:212

約数の個数: 48

約数和(自身を含む): 46126080

約数和(自身を除く): 17907201

約数列:

[1, 3, 9, 13, 39, 43, 71, 79, 117, 129, 213, 237, 387, 559, 639, 711, 923, 1027, 1677, 2769, 3053, 3081, 3397, 5031, 5609, 8307, 9159, 9243, 10191, 16827, 27477, 30573, 39689, 44161, 50481, 72917, 119067, 132483, 218751, 241187, 357201, 397449, 656253, 723561, 2170683, 3135431, 9406293, 28218879]

約数ペア:

[(1, 28218879), (3, 9406293), (9, 3135431), (13, 2170683), (39, 723561), (43, 656253), (71, 397449), (79, 357201), (117, 241187), (129, 218751), (213, 132483), (237, 119067), (387, 72917), (559, 50481), (639, 44161), (711, 39689), (923, 30573), (1027, 27477), (1677, 16827), (2769, 10191), (3053, 9243), (3081, 9159), (3397, 8307), (5031, 5609)]