19810000

素因数分解:

$2^4\times 5^4\times 7^1\times {\mathrm{283}}^1$

素因数の和:318

約数の個数: 100

約数和(自身を含む): 55007392

約数和(自身を除く): 35197392

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 35, 40, 50, 56, 70, 80, 100, 112, 125, 140, 175, 200, 250, 280, 283, 350, 400, 500, 560, 566, 625, 700, 875, 1000, 1132, 1250, 1400, 1415, 1750, 1981, 2000, 2264, 2500, 2800, 2830, 3500, 3962, 4375, 4528, 5000, 5660, 7000, 7075, 7924, 8750, 9905, 10000, 11320, 14000, 14150, 15848, 17500, 19810, 22640, 28300, 31696, 35000, 35375, 39620, 49525, 56600, 70000, 70750, 79240, 99050, 113200, 141500, 158480, 176875, 198100, 247625, 283000, 353750, 396200, 495250, 566000, 707500, 792400, 990500, 1238125, 1415000, 1981000, 2476250, 2830000, 3962000, 4952500, 9905000, 19810000]

約数ペア:

[(1, 19810000), (2, 9905000), (4, 4952500), (5, 3962000), (7, 2830000), (8, 2476250), (10, 1981000), (14, 1415000), (16, 1238125), (20, 990500), (25, 792400), (28, 707500), (35, 566000), (40, 495250), (50, 396200), (56, 353750), (70, 283000), (80, 247625), (100, 198100), (112, 176875), (125, 158480), (140, 141500), (175, 113200), (200, 99050), (250, 79240), (280, 70750), (283, 70000), (350, 56600), (400, 49525), (500, 39620), (560, 35375), (566, 35000), (625, 31696), (700, 28300), (875, 22640), (1000, 19810), (1132, 17500), (1250, 15848), (1400, 14150), (1415, 14000), (1750, 11320), (1981, 10000), (2000, 9905), (2264, 8750), (2500, 7924), (2800, 7075), (2830, 7000), (3500, 5660), (3962, 5000), (4375, 4528)]