20835815

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{181}}^1$

素因数の和:240

約数の個数: 64

約数和(自身を含む): 35223552

約数和(自身を除く): 14387737

約数列:

[1, 5, 7, 11, 13, 23, 35, 55, 65, 77, 91, 115, 143, 161, 181, 253, 299, 385, 455, 715, 805, 905, 1001, 1265, 1267, 1495, 1771, 1991, 2093, 2353, 3289, 4163, 5005, 6335, 8855, 9955, 10465, 11765, 13937, 16445, 16471, 20815, 23023, 25883, 29141, 45793, 54119, 69685, 82355, 115115, 129415, 145705, 181181, 228965, 270595, 320551, 378833, 595309, 905905, 1602755, 1894165, 2976545, 4167163, 20835815]

約数ペア:

[(1, 20835815), (5, 4167163), (7, 2976545), (11, 1894165), (13, 1602755), (23, 905905), (35, 595309), (55, 378833), (65, 320551), (77, 270595), (91, 228965), (115, 181181), (143, 145705), (161, 129415), (181, 115115), (253, 82355), (299, 69685), (385, 54119), (455, 45793), (715, 29141), (805, 25883), (905, 23023), (1001, 20815), (1265, 16471), (1267, 16445), (1495, 13937), (1771, 11765), (1991, 10465), (2093, 9955), (2353, 8855), (3289, 6335), (4163, 5005)]