18979784

素因数分解:

$2^3\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:198

約数の個数: 64

約数和(自身を含む): 40176000

約数和(自身を除く): 21196216

約数列:

[1, 2, 4, 8, 19, 23, 38, 46, 61, 76, 89, 92, 122, 152, 178, 184, 244, 356, 437, 488, 712, 874, 1159, 1403, 1691, 1748, 2047, 2318, 2806, 3382, 3496, 4094, 4636, 5429, 5612, 6764, 8188, 9272, 10858, 11224, 13528, 16376, 21716, 26657, 38893, 43432, 53314, 77786, 103151, 106628, 124867, 155572, 206302, 213256, 249734, 311144, 412604, 499468, 825208, 998936, 2372473, 4744946, 9489892, 18979784]

約数ペア:

[(1, 18979784), (2, 9489892), (4, 4744946), (8, 2372473), (19, 998936), (23, 825208), (38, 499468), (46, 412604), (61, 311144), (76, 249734), (89, 213256), (92, 206302), (122, 155572), (152, 124867), (178, 106628), (184, 103151), (244, 77786), (356, 53314), (437, 43432), (488, 38893), (712, 26657), (874, 21716), (1159, 16376), (1403, 13528), (1691, 11224), (1748, 10858), (2047, 9272), (2318, 8188), (2806, 6764), (3382, 5612), (3496, 5429), (4094, 4636)]