20127920

素因数分解:

$2^4\times 5^1\times {\mathrm{311}}^1\times {\mathrm{809}}^1$

素因数の和:1133

約数の個数: 40

約数和(自身を含む): 47005920

約数和(自身を除く): 26878000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 311, 622, 809, 1244, 1555, 1618, 2488, 3110, 3236, 4045, 4976, 6220, 6472, 8090, 12440, 12944, 16180, 24880, 32360, 64720, 251599, 503198, 1006396, 1257995, 2012792, 2515990, 4025584, 5031980, 10063960, 20127920]

約数ペア:

[(1, 20127920), (2, 10063960), (4, 5031980), (5, 4025584), (8, 2515990), (10, 2012792), (16, 1257995), (20, 1006396), (40, 503198), (80, 251599), (311, 64720), (622, 32360), (809, 24880), (1244, 16180), (1555, 12944), (1618, 12440), (2488, 8090), (3110, 6472), (3236, 6220), (4045, 4976)]