20679040

素因数分解:

$2^7\times 5^1\times {\mathrm{79}}^1\times {\mathrm{409}}^1$

素因数の和:507

約数の個数: 64

約数和(自身を含む): 50184000

約数和(自身を除く): 29504960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 128, 158, 160, 316, 320, 395, 409, 632, 640, 790, 818, 1264, 1580, 1636, 2045, 2528, 3160, 3272, 4090, 5056, 6320, 6544, 8180, 10112, 12640, 13088, 16360, 25280, 26176, 32311, 32720, 50560, 52352, 64622, 65440, 129244, 130880, 161555, 258488, 261760, 323110, 516976, 646220, 1033952, 1292440, 2067904, 2584880, 4135808, 5169760, 10339520, 20679040]

約数ペア:

[(1, 20679040), (2, 10339520), (4, 5169760), (5, 4135808), (8, 2584880), (10, 2067904), (16, 1292440), (20, 1033952), (32, 646220), (40, 516976), (64, 323110), (79, 261760), (80, 258488), (128, 161555), (158, 130880), (160, 129244), (316, 65440), (320, 64622), (395, 52352), (409, 50560), (632, 32720), (640, 32311), (790, 26176), (818, 25280), (1264, 16360), (1580, 13088), (1636, 12640), (2045, 10112), (2528, 8180), (3160, 6544), (3272, 6320), (4090, 5056)]