15640420

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{521}}^1$

素因数の和:628

約数の個数: 48

約数和(自身を含む): 35078400

約数和(自身を除く): 19437980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 79, 95, 158, 190, 316, 380, 395, 521, 790, 1042, 1501, 1580, 2084, 2605, 3002, 5210, 6004, 7505, 9899, 10420, 15010, 19798, 30020, 39596, 41159, 49495, 82318, 98990, 164636, 197980, 205795, 411590, 782021, 823180, 1564042, 3128084, 3910105, 7820210, 15640420]

約数ペア:

[(1, 15640420), (2, 7820210), (4, 3910105), (5, 3128084), (10, 1564042), (19, 823180), (20, 782021), (38, 411590), (76, 205795), (79, 197980), (95, 164636), (158, 98990), (190, 82318), (316, 49495), (380, 41159), (395, 39596), (521, 30020), (790, 19798), (1042, 15010), (1501, 10420), (1580, 9899), (2084, 7505), (2605, 6004), (3002, 5210)]