30781985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{313}}^1$

素因数の和:437

約数の個数: 32

約数和(自身を含む): 42729120

約数和(自身を除く): 11947135

約数列:

[1, 5, 13, 17, 65, 85, 89, 221, 313, 445, 1105, 1157, 1513, 1565, 4069, 5321, 5785, 7565, 19669, 20345, 26605, 27857, 69173, 98345, 139285, 345865, 362141, 473569, 1810705, 2367845, 6156397, 30781985]

約数ペア:

[(1, 30781985), (5, 6156397), (13, 2367845), (17, 1810705), (65, 473569), (85, 362141), (89, 345865), (221, 139285), (313, 98345), (445, 69173), (1105, 27857), (1157, 26605), (1513, 20345), (1565, 19669), (4069, 7565), (5321, 5785)]