20901040

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4283}}^1$

素因数の和:4357

約数の個数: 40

約数和(自身を含む): 49403088

約数和(自身を除く): 28502048

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4283, 4880, 8566, 17132, 21415, 34264, 42830, 68528, 85660, 171320, 261263, 342640, 522526, 1045052, 1306315, 2090104, 2612630, 4180208, 5225260, 10450520, 20901040]

約数ペア:

[(1, 20901040), (2, 10450520), (4, 5225260), (5, 4180208), (8, 2612630), (10, 2090104), (16, 1306315), (20, 1045052), (40, 522526), (61, 342640), (80, 261263), (122, 171320), (244, 85660), (305, 68528), (488, 42830), (610, 34264), (976, 21415), (1220, 17132), (2440, 8566), (4283, 4880)]