21978194

素因数分解:

$2^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{569}}^1$

素因数の和:698

約数の個数: 32

約数和(自身を含む): 39398400

約数和(自身を除く): 17420206

約数列:

[1, 2, 7, 14, 31, 62, 89, 178, 217, 434, 569, 623, 1138, 1246, 2759, 3983, 5518, 7966, 17639, 19313, 35278, 38626, 50641, 101282, 123473, 246946, 354487, 708974, 1569871, 3139742, 10989097, 21978194]

約数ペア:

[(1, 21978194), (2, 10989097), (7, 3139742), (14, 1569871), (31, 708974), (62, 354487), (89, 246946), (178, 123473), (217, 101282), (434, 50641), (569, 38626), (623, 35278), (1138, 19313), (1246, 17639), (2759, 7966), (3983, 5518)]