20816000

素因数分解:

$2^7\times 5^3\times {\mathrm{1301}}^1$

素因数の和:1330

約数の個数: 64

約数和(自身を含む): 51793560

約数和(自身を除く): 30977560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1301, 1600, 2000, 2602, 3200, 4000, 5204, 6505, 8000, 10408, 13010, 16000, 20816, 26020, 32525, 41632, 52040, 65050, 83264, 104080, 130100, 162625, 166528, 208160, 260200, 325250, 416320, 520400, 650500, 832640, 1040800, 1301000, 2081600, 2602000, 4163200, 5204000, 10408000, 20816000]

約数ペア:

[(1, 20816000), (2, 10408000), (4, 5204000), (5, 4163200), (8, 2602000), (10, 2081600), (16, 1301000), (20, 1040800), (25, 832640), (32, 650500), (40, 520400), (50, 416320), (64, 325250), (80, 260200), (100, 208160), (125, 166528), (128, 162625), (160, 130100), (200, 104080), (250, 83264), (320, 65050), (400, 52040), (500, 41632), (640, 32525), (800, 26020), (1000, 20816), (1301, 16000), (1600, 13010), (2000, 10408), (2602, 8000), (3200, 6505), (4000, 5204)]