19987000

素因数分解:

$2^3\times 5^3\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{79}}^1$

素因数の和:134

約数の個数: 128

約数和(自身を含む): 53913600

約数和(自身を除く): 33926600

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 23, 25, 40, 44, 46, 50, 55, 79, 88, 92, 100, 110, 115, 125, 158, 184, 200, 220, 230, 250, 253, 275, 316, 395, 440, 460, 500, 506, 550, 575, 632, 790, 869, 920, 1000, 1012, 1100, 1150, 1265, 1375, 1580, 1738, 1817, 1975, 2024, 2200, 2300, 2530, 2750, 2875, 3160, 3476, 3634, 3950, 4345, 4600, 5060, 5500, 5750, 6325, 6952, 7268, 7900, 8690, 9085, 9875, 10120, 11000, 11500, 12650, 14536, 15800, 17380, 18170, 19750, 19987, 21725, 23000, 25300, 31625, 34760, 36340, 39500, 39974, 43450, 45425, 50600, 63250, 72680, 79000, 79948, 86900, 90850, 99935, 108625, 126500, 159896, 173800, 181700, 199870, 217250, 227125, 253000, 363400, 399740, 434500, 454250, 499675, 799480, 869000, 908500, 999350, 1817000, 1998700, 2498375, 3997400, 4996750, 9993500, 19987000]

約数ペア:

[(1, 19987000), (2, 9993500), (4, 4996750), (5, 3997400), (8, 2498375), (10, 1998700), (11, 1817000), (20, 999350), (22, 908500), (23, 869000), (25, 799480), (40, 499675), (44, 454250), (46, 434500), (50, 399740), (55, 363400), (79, 253000), (88, 227125), (92, 217250), (100, 199870), (110, 181700), (115, 173800), (125, 159896), (158, 126500), (184, 108625), (200, 99935), (220, 90850), (230, 86900), (250, 79948), (253, 79000), (275, 72680), (316, 63250), (395, 50600), (440, 45425), (460, 43450), (500, 39974), (506, 39500), (550, 36340), (575, 34760), (632, 31625), (790, 25300), (869, 23000), (920, 21725), (1000, 19987), (1012, 19750), (1100, 18170), (1150, 17380), (1265, 15800), (1375, 14536), (1580, 12650), (1738, 11500), (1817, 11000), (1975, 10120), (2024, 9875), (2200, 9085), (2300, 8690), (2530, 7900), (2750, 7268), (2875, 6952), (3160, 6325), (3476, 5750), (3634, 5500), (3950, 5060), (4345, 4600)]