19820000

素因数分解:

$2^5\times 5^4\times {\mathrm{991}}^1$

素因数の和:1021

約数の個数: 60

約数和(自身を含む): 48809376

約数和(自身を除く): 28989376

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 625, 800, 991, 1000, 1250, 1982, 2000, 2500, 3964, 4000, 4955, 5000, 7928, 9910, 10000, 15856, 19820, 20000, 24775, 31712, 39640, 49550, 79280, 99100, 123875, 158560, 198200, 247750, 396400, 495500, 619375, 792800, 991000, 1238750, 1982000, 2477500, 3964000, 4955000, 9910000, 19820000]

約数ペア:

[(1, 19820000), (2, 9910000), (4, 4955000), (5, 3964000), (8, 2477500), (10, 1982000), (16, 1238750), (20, 991000), (25, 792800), (32, 619375), (40, 495500), (50, 396400), (80, 247750), (100, 198200), (125, 158560), (160, 123875), (200, 99100), (250, 79280), (400, 49550), (500, 39640), (625, 31712), (800, 24775), (991, 20000), (1000, 19820), (1250, 15856), (1982, 10000), (2000, 9910), (2500, 7928), (3964, 5000), (4000, 4955)]