20727819

素因数分解:

$3^4\times 7^1\times {\mathrm{139}}^1\times {\mathrm{263}}^1$

素因数の和:421

約数の個数: 40

約数和(自身を含む): 35777280

約数和(自身を除く): 15049461

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 139, 189, 263, 417, 567, 789, 973, 1251, 1841, 2367, 2919, 3753, 5523, 7101, 8757, 11259, 16569, 21303, 26271, 36557, 49707, 78813, 109671, 149121, 255899, 329013, 767697, 987039, 2303091, 2961117, 6909273, 20727819]

約数ペア:

[(1, 20727819), (3, 6909273), (7, 2961117), (9, 2303091), (21, 987039), (27, 767697), (63, 329013), (81, 255899), (139, 149121), (189, 109671), (263, 78813), (417, 49707), (567, 36557), (789, 26271), (973, 21303), (1251, 16569), (1841, 11259), (2367, 8757), (2919, 7101), (3753, 5523)]