21040120

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8623}}^1$

素因数の和:8695

約数の個数: 32

約数和(自身を含む): 48121920

約数和(自身を除く): 27081800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8623, 17246, 34492, 43115, 68984, 86230, 172460, 344920, 526003, 1052006, 2104012, 2630015, 4208024, 5260030, 10520060, 21040120]

約数ペア:

[(1, 21040120), (2, 10520060), (4, 5260030), (5, 4208024), (8, 2630015), (10, 2104012), (20, 1052006), (40, 526003), (61, 344920), (122, 172460), (244, 86230), (305, 68984), (488, 43115), (610, 34492), (1220, 17246), (2440, 8623)]