21297255

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{89}}^1$

素因数の和:200

約数の個数: 64

約数和(自身を含む): 41057280

約数和(自身を除く): 19760025

約数列:

[1, 3, 5, 7, 15, 21, 35, 43, 53, 89, 105, 129, 159, 215, 265, 267, 301, 371, 445, 623, 645, 795, 903, 1113, 1335, 1505, 1855, 1869, 2279, 3115, 3827, 4515, 4717, 5565, 6837, 9345, 11395, 11481, 14151, 15953, 19135, 23585, 26789, 33019, 34185, 47859, 57405, 70755, 79765, 80367, 99057, 133945, 165095, 202831, 239295, 401835, 495285, 608493, 1014155, 1419817, 3042465, 4259451, 7099085, 21297255]

約数ペア:

[(1, 21297255), (3, 7099085), (5, 4259451), (7, 3042465), (15, 1419817), (21, 1014155), (35, 608493), (43, 495285), (53, 401835), (89, 239295), (105, 202831), (129, 165095), (159, 133945), (215, 99057), (265, 80367), (267, 79765), (301, 70755), (371, 57405), (445, 47859), (623, 34185), (645, 33019), (795, 26789), (903, 23585), (1113, 19135), (1335, 15953), (1505, 14151), (1855, 11481), (1869, 11395), (2279, 9345), (3115, 6837), (3827, 5565), (4515, 4717)]