21001600

素因数分解:

$2^7\times 5^2\times {\mathrm{6563}}^1$

素因数の和:6587

約数の個数: 48

約数和(自身を含む): 51888420

約数和(自身を除く): 30886820

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 320, 400, 640, 800, 1600, 3200, 6563, 13126, 26252, 32815, 52504, 65630, 105008, 131260, 164075, 210016, 262520, 328150, 420032, 525040, 656300, 840064, 1050080, 1312600, 2100160, 2625200, 4200320, 5250400, 10500800, 21001600]

約数ペア:

[(1, 21001600), (2, 10500800), (4, 5250400), (5, 4200320), (8, 2625200), (10, 2100160), (16, 1312600), (20, 1050080), (25, 840064), (32, 656300), (40, 525040), (50, 420032), (64, 328150), (80, 262520), (100, 210016), (128, 164075), (160, 131260), (200, 105008), (320, 65630), (400, 52504), (640, 32815), (800, 26252), (1600, 13126), (3200, 6563)]