20640978

素因数分解:

$2^1\times 3^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{521}}^1$

素因数の和:631

約数の個数: 48

約数和(自身を含む): 46904832

約数和(自身を除く): 26263854

約数列:

[1, 2, 3, 6, 9, 18, 31, 62, 71, 93, 142, 186, 213, 279, 426, 521, 558, 639, 1042, 1278, 1563, 2201, 3126, 4402, 4689, 6603, 9378, 13206, 16151, 19809, 32302, 36991, 39618, 48453, 73982, 96906, 110973, 145359, 221946, 290718, 332919, 665838, 1146721, 2293442, 3440163, 6880326, 10320489, 20640978]

約数ペア:

[(1, 20640978), (2, 10320489), (3, 6880326), (6, 3440163), (9, 2293442), (18, 1146721), (31, 665838), (62, 332919), (71, 290718), (93, 221946), (142, 145359), (186, 110973), (213, 96906), (279, 73982), (426, 48453), (521, 39618), (558, 36991), (639, 32302), (1042, 19809), (1278, 16151), (1563, 13206), (2201, 9378), (3126, 6603), (4402, 4689)]