20012800

素因数分解:

$2^8\times 5^2\times {\mathrm{53}}^1\times {\mathrm{59}}^1$

素因数の和:138

約数の個数: 108

約数和(自身を含む): 51324840

約数和(自身を除く): 31312040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 53, 59, 64, 80, 100, 106, 118, 128, 160, 200, 212, 236, 256, 265, 295, 320, 400, 424, 472, 530, 590, 640, 800, 848, 944, 1060, 1180, 1280, 1325, 1475, 1600, 1696, 1888, 2120, 2360, 2650, 2950, 3127, 3200, 3392, 3776, 4240, 4720, 5300, 5900, 6254, 6400, 6784, 7552, 8480, 9440, 10600, 11800, 12508, 13568, 15104, 15635, 16960, 18880, 21200, 23600, 25016, 31270, 33920, 37760, 42400, 47200, 50032, 62540, 67840, 75520, 78175, 84800, 94400, 100064, 125080, 156350, 169600, 188800, 200128, 250160, 312700, 339200, 377600, 400256, 500320, 625400, 800512, 1000640, 1250800, 2001280, 2501600, 4002560, 5003200, 10006400, 20012800]

約数ペア:

[(1, 20012800), (2, 10006400), (4, 5003200), (5, 4002560), (8, 2501600), (10, 2001280), (16, 1250800), (20, 1000640), (25, 800512), (32, 625400), (40, 500320), (50, 400256), (53, 377600), (59, 339200), (64, 312700), (80, 250160), (100, 200128), (106, 188800), (118, 169600), (128, 156350), (160, 125080), (200, 100064), (212, 94400), (236, 84800), (256, 78175), (265, 75520), (295, 67840), (320, 62540), (400, 50032), (424, 47200), (472, 42400), (530, 37760), (590, 33920), (640, 31270), (800, 25016), (848, 23600), (944, 21200), (1060, 18880), (1180, 16960), (1280, 15635), (1325, 15104), (1475, 13568), (1600, 12508), (1696, 11800), (1888, 10600), (2120, 9440), (2360, 8480), (2650, 7552), (2950, 6784), (3127, 6400), (3200, 6254), (3392, 5900), (3776, 5300), (4240, 4720)]