19901648

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{587}}^1$

素因数の和:771

約数の個数: 40

約数和(自身を含む): 41851488

約数和(自身を除く): 21949840

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 163, 208, 326, 587, 652, 1174, 1304, 2119, 2348, 2608, 4238, 4696, 7631, 8476, 9392, 15262, 16952, 30524, 33904, 61048, 95681, 122096, 191362, 382724, 765448, 1243853, 1530896, 2487706, 4975412, 9950824, 19901648]

約数ペア:

[(1, 19901648), (2, 9950824), (4, 4975412), (8, 2487706), (13, 1530896), (16, 1243853), (26, 765448), (52, 382724), (104, 191362), (163, 122096), (208, 95681), (326, 61048), (587, 33904), (652, 30524), (1174, 16952), (1304, 15262), (2119, 9392), (2348, 8476), (2608, 7631), (4238, 4696)]