19980400

素因数分解:

$2^4\times 5^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{239}}^1$

素因数の和:287

約数の個数: 120

約数和(自身を含む): 55353600

約数和(自身を除く): 35373200

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 19, 20, 22, 25, 38, 40, 44, 50, 55, 76, 80, 88, 95, 100, 110, 152, 176, 190, 200, 209, 220, 239, 275, 304, 380, 400, 418, 440, 475, 478, 550, 760, 836, 880, 950, 956, 1045, 1100, 1195, 1520, 1672, 1900, 1912, 2090, 2200, 2390, 2629, 3344, 3800, 3824, 4180, 4400, 4541, 4780, 5225, 5258, 5975, 7600, 8360, 9082, 9560, 10450, 10516, 11950, 13145, 16720, 18164, 19120, 20900, 21032, 22705, 23900, 26290, 36328, 41800, 42064, 45410, 47800, 49951, 52580, 65725, 72656, 83600, 90820, 95600, 99902, 105160, 113525, 131450, 181640, 199804, 210320, 227050, 249755, 262900, 363280, 399608, 454100, 499510, 525800, 799216, 908200, 999020, 1051600, 1248775, 1816400, 1998040, 2497550, 3996080, 4995100, 9990200, 19980400]

約数ペア:

[(1, 19980400), (2, 9990200), (4, 4995100), (5, 3996080), (8, 2497550), (10, 1998040), (11, 1816400), (16, 1248775), (19, 1051600), (20, 999020), (22, 908200), (25, 799216), (38, 525800), (40, 499510), (44, 454100), (50, 399608), (55, 363280), (76, 262900), (80, 249755), (88, 227050), (95, 210320), (100, 199804), (110, 181640), (152, 131450), (176, 113525), (190, 105160), (200, 99902), (209, 95600), (220, 90820), (239, 83600), (275, 72656), (304, 65725), (380, 52580), (400, 49951), (418, 47800), (440, 45410), (475, 42064), (478, 41800), (550, 36328), (760, 26290), (836, 23900), (880, 22705), (950, 21032), (956, 20900), (1045, 19120), (1100, 18164), (1195, 16720), (1520, 13145), (1672, 11950), (1900, 10516), (1912, 10450), (2090, 9560), (2200, 9082), (2390, 8360), (2629, 7600), (3344, 5975), (3800, 5258), (3824, 5225), (4180, 4780), (4400, 4541)]