21091665

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:202

約数の個数: 64

約数和(自身を含む): 40711680

約数和(自身を除く): 19620015

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 61, 89, 105, 111, 183, 185, 259, 267, 305, 427, 445, 555, 623, 777, 915, 1281, 1295, 1335, 1869, 2135, 2257, 3115, 3293, 3885, 5429, 6405, 6771, 9345, 9879, 11285, 15799, 16287, 16465, 23051, 27145, 33855, 38003, 47397, 49395, 69153, 78995, 81435, 114009, 115255, 190015, 200873, 236985, 345765, 570045, 602619, 1004365, 1406111, 3013095, 4218333, 7030555, 21091665]

約数ペア:

[(1, 21091665), (3, 7030555), (5, 4218333), (7, 3013095), (15, 1406111), (21, 1004365), (35, 602619), (37, 570045), (61, 345765), (89, 236985), (105, 200873), (111, 190015), (183, 115255), (185, 114009), (259, 81435), (267, 78995), (305, 69153), (427, 49395), (445, 47397), (555, 38003), (623, 33855), (777, 27145), (915, 23051), (1281, 16465), (1295, 16287), (1335, 15799), (1869, 11285), (2135, 9879), (2257, 9345), (3115, 6771), (3293, 6405), (3885, 5429)]