40720000

素因数分解:

$2^7\times 5^4\times {\mathrm{509}}^1$

素因数の和:543

約数の個数: 80

約数和(自身を含む): 101569050

約数和(自身を除く): 60849050

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 320, 400, 500, 509, 625, 640, 800, 1000, 1018, 1250, 1600, 2000, 2036, 2500, 2545, 3200, 4000, 4072, 5000, 5090, 8000, 8144, 10000, 10180, 12725, 16000, 16288, 20000, 20360, 25450, 32576, 40000, 40720, 50900, 63625, 65152, 80000, 81440, 101800, 127250, 162880, 203600, 254500, 318125, 325760, 407200, 509000, 636250, 814400, 1018000, 1272500, 1628800, 2036000, 2545000, 4072000, 5090000, 8144000, 10180000, 20360000, 40720000]

約数ペア:

[(1, 40720000), (2, 20360000), (4, 10180000), (5, 8144000), (8, 5090000), (10, 4072000), (16, 2545000), (20, 2036000), (25, 1628800), (32, 1272500), (40, 1018000), (50, 814400), (64, 636250), (80, 509000), (100, 407200), (125, 325760), (128, 318125), (160, 254500), (200, 203600), (250, 162880), (320, 127250), (400, 101800), (500, 81440), (509, 80000), (625, 65152), (640, 63625), (800, 50900), (1000, 40720), (1018, 40000), (1250, 32576), (1600, 25450), (2000, 20360), (2036, 20000), (2500, 16288), (2545, 16000), (3200, 12725), (4000, 10180), (4072, 10000), (5000, 8144), (5090, 8000)]