20983760

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{101}}^1$

素因数の和:181

約数の個数: 120

約数和(自身を含む): 58395816

約数和(自身を除く): 37412056

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 53, 56, 70, 80, 98, 101, 106, 112, 140, 196, 202, 212, 245, 265, 280, 371, 392, 404, 424, 490, 505, 530, 560, 707, 742, 784, 808, 848, 980, 1010, 1060, 1414, 1484, 1616, 1855, 1960, 2020, 2120, 2597, 2828, 2968, 3535, 3710, 3920, 4040, 4240, 4949, 5194, 5353, 5656, 5936, 7070, 7420, 8080, 9898, 10388, 10706, 11312, 12985, 14140, 14840, 19796, 20776, 21412, 24745, 25970, 26765, 28280, 29680, 37471, 39592, 41552, 42824, 49490, 51940, 53530, 56560, 74942, 79184, 85648, 98980, 103880, 107060, 149884, 187355, 197960, 207760, 214120, 262297, 299768, 374710, 395920, 428240, 524594, 599536, 749420, 1049188, 1311485, 1498840, 2098376, 2622970, 2997680, 4196752, 5245940, 10491880, 20983760]

約数ペア:

[(1, 20983760), (2, 10491880), (4, 5245940), (5, 4196752), (7, 2997680), (8, 2622970), (10, 2098376), (14, 1498840), (16, 1311485), (20, 1049188), (28, 749420), (35, 599536), (40, 524594), (49, 428240), (53, 395920), (56, 374710), (70, 299768), (80, 262297), (98, 214120), (101, 207760), (106, 197960), (112, 187355), (140, 149884), (196, 107060), (202, 103880), (212, 98980), (245, 85648), (265, 79184), (280, 74942), (371, 56560), (392, 53530), (404, 51940), (424, 49490), (490, 42824), (505, 41552), (530, 39592), (560, 37471), (707, 29680), (742, 28280), (784, 26765), (808, 25970), (848, 24745), (980, 21412), (1010, 20776), (1060, 19796), (1414, 14840), (1484, 14140), (1616, 12985), (1855, 11312), (1960, 10706), (2020, 10388), (2120, 9898), (2597, 8080), (2828, 7420), (2968, 7070), (3535, 5936), (3710, 5656), (3920, 5353), (4040, 5194), (4240, 4949)]