21580728

素因数分解:

$2^3\times 3^1\times {\mathrm{13}}^1\times {\mathrm{263}}^2$

素因数の和:548

約数の個数: 48

約数和(自身を含む): 58323720

約数和(自身を除く): 36742992

約数列:

[1, 2, 3, 4, 6, 8, 12, 13, 24, 26, 39, 52, 78, 104, 156, 263, 312, 526, 789, 1052, 1578, 2104, 3156, 3419, 6312, 6838, 10257, 13676, 20514, 27352, 41028, 69169, 82056, 138338, 207507, 276676, 415014, 553352, 830028, 899197, 1660056, 1798394, 2697591, 3596788, 5395182, 7193576, 10790364, 21580728]

約数ペア:

[(1, 21580728), (2, 10790364), (3, 7193576), (4, 5395182), (6, 3596788), (8, 2697591), (12, 1798394), (13, 1660056), (24, 899197), (26, 830028), (39, 553352), (52, 415014), (78, 276676), (104, 207507), (156, 138338), (263, 82056), (312, 69169), (526, 41028), (789, 27352), (1052, 20514), (1578, 13676), (2104, 10257), (3156, 6838), (3419, 6312)]