20807920

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{73}}^1\times {\mathrm{509}}^1$

素因数の和:602

約数の個数: 80

約数和(自身を含む): 56157120

約数和(自身を除く): 35349200

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 73, 80, 112, 140, 146, 280, 292, 365, 509, 511, 560, 584, 730, 1018, 1022, 1168, 1460, 2036, 2044, 2545, 2555, 2920, 3563, 4072, 4088, 5090, 5110, 5840, 7126, 8144, 8176, 10180, 10220, 14252, 17815, 20360, 20440, 28504, 35630, 37157, 40720, 40880, 57008, 71260, 74314, 142520, 148628, 185785, 260099, 285040, 297256, 371570, 520198, 594512, 743140, 1040396, 1300495, 1486280, 2080792, 2600990, 2972560, 4161584, 5201980, 10403960, 20807920]

約数ペア:

[(1, 20807920), (2, 10403960), (4, 5201980), (5, 4161584), (7, 2972560), (8, 2600990), (10, 2080792), (14, 1486280), (16, 1300495), (20, 1040396), (28, 743140), (35, 594512), (40, 520198), (56, 371570), (70, 297256), (73, 285040), (80, 260099), (112, 185785), (140, 148628), (146, 142520), (280, 74314), (292, 71260), (365, 57008), (509, 40880), (511, 40720), (560, 37157), (584, 35630), (730, 28504), (1018, 20440), (1022, 20360), (1168, 17815), (1460, 14252), (2036, 10220), (2044, 10180), (2545, 8176), (2555, 8144), (2920, 7126), (3563, 5840), (4072, 5110), (4088, 5090)]