1640394880

素因数分解:

$2^7\times 5^1\times {\mathrm{2563117}}^1$

素因数の和:2563136

約数の個数: 32

約数和(自身を含む): 3921570540

約数和(自身を除く): 2281175660

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 2563117, 5126234, 10252468, 12815585, 20504936, 25631170, 41009872, 51262340, 82019744, 102524680, 164039488, 205049360, 328078976, 410098720, 820197440, 1640394880]

約数ペア:

[(1, 1640394880), (2, 820197440), (4, 410098720), (5, 328078976), (8, 205049360), (10, 164039488), (16, 102524680), (20, 82019744), (32, 51262340), (40, 41009872), (64, 25631170), (80, 20504936), (128, 12815585), (160, 10252468), (320, 5126234), (640, 2563117)]