21438725

素因数分解:

$5^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1$

素因数の和:115

約数の個数: 72

約数和(自身を含む): 35453088

約数和(自身を除く): 14014363

約数列:

[1, 5, 7, 11, 25, 35, 37, 43, 49, 55, 77, 175, 185, 215, 245, 259, 275, 301, 385, 407, 473, 539, 925, 1075, 1225, 1295, 1505, 1591, 1813, 1925, 2035, 2107, 2365, 2695, 2849, 3311, 6475, 7525, 7955, 9065, 10175, 10535, 11137, 11825, 13475, 14245, 16555, 17501, 19943, 23177, 39775, 45325, 52675, 55685, 71225, 77959, 82775, 87505, 99715, 115885, 122507, 278425, 389795, 437525, 498575, 579425, 612535, 857549, 1948975, 3062675, 4287745, 21438725]

約数ペア:

[(1, 21438725), (5, 4287745), (7, 3062675), (11, 1948975), (25, 857549), (35, 612535), (37, 579425), (43, 498575), (49, 437525), (55, 389795), (77, 278425), (175, 122507), (185, 115885), (215, 99715), (245, 87505), (259, 82775), (275, 77959), (301, 71225), (385, 55685), (407, 52675), (473, 45325), (539, 39775), (925, 23177), (1075, 19943), (1225, 17501), (1295, 16555), (1505, 14245), (1591, 13475), (1813, 11825), (1925, 11137), (2035, 10535), (2107, 10175), (2365, 9065), (2695, 7955), (2849, 7525), (3311, 6475)]