20748800

素因数分解:

$2^9\times 5^2\times {\mathrm{1621}}^1$

素因数の和:1649

約数の個数: 60

約数和(自身を含む): 51438486

約数和(自身を除く): 30689686

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 400, 512, 640, 800, 1280, 1600, 1621, 2560, 3200, 3242, 6400, 6484, 8105, 12800, 12968, 16210, 25936, 32420, 40525, 51872, 64840, 81050, 103744, 129680, 162100, 207488, 259360, 324200, 414976, 518720, 648400, 829952, 1037440, 1296800, 2074880, 2593600, 4149760, 5187200, 10374400, 20748800]

約数ペア:

[(1, 20748800), (2, 10374400), (4, 5187200), (5, 4149760), (8, 2593600), (10, 2074880), (16, 1296800), (20, 1037440), (25, 829952), (32, 648400), (40, 518720), (50, 414976), (64, 324200), (80, 259360), (100, 207488), (128, 162100), (160, 129680), (200, 103744), (256, 81050), (320, 64840), (400, 51872), (512, 40525), (640, 32420), (800, 25936), (1280, 16210), (1600, 12968), (1621, 12800), (2560, 8105), (3200, 6484), (3242, 6400)]