20489440

素因数分解:

$2^5\times 5^1\times {\mathrm{79}}^1\times {\mathrm{1621}}^1$

素因数の和:1715

約数の個数: 48

約数和(自身を含む): 49049280

約数和(自身を除く): 28559840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 79, 80, 158, 160, 316, 395, 632, 790, 1264, 1580, 1621, 2528, 3160, 3242, 6320, 6484, 8105, 12640, 12968, 16210, 25936, 32420, 51872, 64840, 128059, 129680, 256118, 259360, 512236, 640295, 1024472, 1280590, 2048944, 2561180, 4097888, 5122360, 10244720, 20489440]

約数ペア:

[(1, 20489440), (2, 10244720), (4, 5122360), (5, 4097888), (8, 2561180), (10, 2048944), (16, 1280590), (20, 1024472), (32, 640295), (40, 512236), (79, 259360), (80, 256118), (158, 129680), (160, 128059), (316, 64840), (395, 51872), (632, 32420), (790, 25936), (1264, 16210), (1580, 12968), (1621, 12640), (2528, 8105), (3160, 6484), (3242, 6320)]