81305306.000000000

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{689599}}^1$

素因数の和:689615

約数の個数: 40

約数和(自身を含む): 513062400

約数和(自身を除く): 347558640

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240, 689599, 1379198, 2068797, 2758396, 3447995, 4137594, 5516792, 6895990, 8275188, 10343985, 11033584, 13791980, 16550376, 20687970, 27583960, 33100752, 41375940, 55167920, 82751880, 165503760]

約数ペア:

[(1, 165503760), (2, 82751880), (3, 55167920), (4, 41375940), (5, 33100752), (6, 27583960), (8, 20687970), (10, 16550376), (12, 13791980), (15, 11033584), (16, 10343985), (20, 8275188), (24, 6895990), (30, 5516792), (40, 4137594), (48, 3447995), (60, 2758396), (80, 2068797), (120, 1379198), (240, 689599)]