21005172

素因数分解:

$2^2\times 3^2\times {\mathrm{53}}^1\times {\mathrm{101}}^1\times {\mathrm{109}}^1$

素因数の和:273

約数の個数: 72

約数和(自身を含む): 55135080

約数和(自身を除く): 34129908

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 53, 101, 106, 109, 159, 202, 212, 218, 303, 318, 327, 404, 436, 477, 606, 636, 654, 909, 954, 981, 1212, 1308, 1818, 1908, 1962, 3636, 3924, 5353, 5777, 10706, 11009, 11554, 16059, 17331, 21412, 22018, 23108, 32118, 33027, 34662, 44036, 48177, 51993, 64236, 66054, 69324, 96354, 99081, 103986, 132108, 192708, 198162, 207972, 396324, 583477, 1166954, 1750431, 2333908, 3500862, 5251293, 7001724, 10502586, 21005172]

約数ペア:

[(1, 21005172), (2, 10502586), (3, 7001724), (4, 5251293), (6, 3500862), (9, 2333908), (12, 1750431), (18, 1166954), (36, 583477), (53, 396324), (101, 207972), (106, 198162), (109, 192708), (159, 132108), (202, 103986), (212, 99081), (218, 96354), (303, 69324), (318, 66054), (327, 64236), (404, 51993), (436, 48177), (477, 44036), (606, 34662), (636, 33027), (654, 32118), (909, 23108), (954, 22018), (981, 21412), (1212, 17331), (1308, 16059), (1818, 11554), (1908, 11009), (1962, 10706), (3636, 5777), (3924, 5353)]