20511988

素因数分解:

$2^2\times 7^2\times {\mathrm{229}}^1\times {\mathrm{457}}^1$

素因数の和:704

約数の個数: 36

約数和(自身を含む): 42030660

約数和(自身を除く): 21518672

約数列:

[1, 2, 4, 7, 14, 28, 49, 98, 196, 229, 457, 458, 914, 916, 1603, 1828, 3199, 3206, 6398, 6412, 11221, 12796, 22393, 22442, 44786, 44884, 89572, 104653, 209306, 418612, 732571, 1465142, 2930284, 5127997, 10255994, 20511988]

約数ペア:

[(1, 20511988), (2, 10255994), (4, 5127997), (7, 2930284), (14, 1465142), (28, 732571), (49, 418612), (98, 209306), (196, 104653), (229, 89572), (457, 44884), (458, 44786), (914, 22442), (916, 22393), (1603, 12796), (1828, 11221), (3199, 6412), (3206, 6398)]