21681675

素因数分解:

$3^5\times 5^2\times {\mathrm{43}}^1\times {\mathrm{83}}^1$

素因数の和:151

約数の個数: 72

約数和(自身を含む): 41705664

約数和(自身を除く): 20023989

約数列:

[1, 3, 5, 9, 15, 25, 27, 43, 45, 75, 81, 83, 129, 135, 215, 225, 243, 249, 387, 405, 415, 645, 675, 747, 1075, 1161, 1215, 1245, 1935, 2025, 2075, 2241, 3225, 3483, 3569, 3735, 5805, 6075, 6225, 6723, 9675, 10449, 10707, 11205, 17415, 17845, 18675, 20169, 29025, 32121, 33615, 52245, 53535, 56025, 87075, 89225, 96363, 100845, 160605, 168075, 261225, 267675, 289089, 481815, 504225, 803025, 867267, 1445445, 2409075, 4336335, 7227225, 21681675]

約数ペア:

[(1, 21681675), (3, 7227225), (5, 4336335), (9, 2409075), (15, 1445445), (25, 867267), (27, 803025), (43, 504225), (45, 481815), (75, 289089), (81, 267675), (83, 261225), (129, 168075), (135, 160605), (215, 100845), (225, 96363), (243, 89225), (249, 87075), (387, 56025), (405, 53535), (415, 52245), (645, 33615), (675, 32121), (747, 29025), (1075, 20169), (1161, 18675), (1215, 17845), (1245, 17415), (1935, 11205), (2025, 10707), (2075, 10449), (2241, 9675), (3225, 6723), (3483, 6225), (3569, 6075), (3735, 5805)]