20991474

素因数分解:

$2^1\times 3^4\times 7^1\times {\mathrm{107}}^1\times {\mathrm{173}}^1$

素因数の和:301

約数の個数: 80

約数和(自身を含む): 54571968

約数和(自身を除く): 33580494

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 81, 107, 126, 162, 173, 189, 214, 321, 346, 378, 519, 567, 642, 749, 963, 1038, 1134, 1211, 1498, 1557, 1926, 2247, 2422, 2889, 3114, 3633, 4494, 4671, 5778, 6741, 7266, 8667, 9342, 10899, 13482, 14013, 17334, 18511, 20223, 21798, 28026, 32697, 37022, 40446, 55533, 60669, 65394, 98091, 111066, 121338, 129577, 166599, 196182, 259154, 333198, 388731, 499797, 777462, 999594, 1166193, 1499391, 2332386, 2998782, 3498579, 6997158, 10495737, 20991474]

約数ペア:

[(1, 20991474), (2, 10495737), (3, 6997158), (6, 3498579), (7, 2998782), (9, 2332386), (14, 1499391), (18, 1166193), (21, 999594), (27, 777462), (42, 499797), (54, 388731), (63, 333198), (81, 259154), (107, 196182), (126, 166599), (162, 129577), (173, 121338), (189, 111066), (214, 98091), (321, 65394), (346, 60669), (378, 55533), (519, 40446), (567, 37022), (642, 32697), (749, 28026), (963, 21798), (1038, 20223), (1134, 18511), (1211, 17334), (1498, 14013), (1557, 13482), (1926, 10899), (2247, 9342), (2422, 8667), (2889, 7266), (3114, 6741), (3633, 5778), (4494, 4671)]