21815680

素因数分解:

$2^7\times 5^1\times {\mathrm{89}}^1\times {\mathrm{383}}^1$

素因数の和:491

約数の個数: 64

約数和(自身を含む): 52876800

約数和(自身を除く): 31061120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 89, 128, 160, 178, 320, 356, 383, 445, 640, 712, 766, 890, 1424, 1532, 1780, 1915, 2848, 3064, 3560, 3830, 5696, 6128, 7120, 7660, 11392, 12256, 14240, 15320, 24512, 28480, 30640, 34087, 49024, 56960, 61280, 68174, 122560, 136348, 170435, 245120, 272696, 340870, 545392, 681740, 1090784, 1363480, 2181568, 2726960, 4363136, 5453920, 10907840, 21815680]

約数ペア:

[(1, 21815680), (2, 10907840), (4, 5453920), (5, 4363136), (8, 2726960), (10, 2181568), (16, 1363480), (20, 1090784), (32, 681740), (40, 545392), (64, 340870), (80, 272696), (89, 245120), (128, 170435), (160, 136348), (178, 122560), (320, 68174), (356, 61280), (383, 56960), (445, 49024), (640, 34087), (712, 30640), (766, 28480), (890, 24512), (1424, 15320), (1532, 14240), (1780, 12256), (1915, 11392), (2848, 7660), (3064, 7120), (3560, 6128), (3830, 5696)]