21218995

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{613}}^1$

素因数の和:691

約数の個数: 32

約数和(自身を含む): 31122432

約数和(自身を除く): 9903437

約数列:

[1, 5, 7, 23, 35, 43, 115, 161, 215, 301, 613, 805, 989, 1505, 3065, 4291, 4945, 6923, 14099, 21455, 26359, 34615, 70495, 98693, 131795, 184513, 493465, 606257, 922565, 3031285, 4243799, 21218995]

約数ペア:

[(1, 21218995), (5, 4243799), (7, 3031285), (23, 922565), (35, 606257), (43, 493465), (115, 184513), (161, 131795), (215, 98693), (301, 70495), (613, 34615), (805, 26359), (989, 21455), (1505, 14099), (3065, 6923), (4291, 4945)]