21015825

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{311}}^1$

素因数の和:394

約数の個数: 48

約数和(自身を含む): 37604736

約数和(自身を除く): 16588911

約数列:

[1, 3, 5, 15, 17, 25, 51, 53, 75, 85, 159, 255, 265, 311, 425, 795, 901, 933, 1275, 1325, 1555, 2703, 3975, 4505, 4665, 5287, 7775, 13515, 15861, 16483, 22525, 23325, 26435, 49449, 67575, 79305, 82415, 132175, 247245, 280211, 396525, 412075, 840633, 1236225, 1401055, 4203165, 7005275, 21015825]

約数ペア:

[(1, 21015825), (3, 7005275), (5, 4203165), (15, 1401055), (17, 1236225), (25, 840633), (51, 412075), (53, 396525), (75, 280211), (85, 247245), (159, 132175), (255, 82415), (265, 79305), (311, 67575), (425, 49449), (795, 26435), (901, 23325), (933, 22525), (1275, 16483), (1325, 15861), (1555, 13515), (2703, 7775), (3975, 5287), (4505, 4665)]