21251840

素因数分解:

$2^8\times 5^1\times {\mathrm{16603}}^1$

素因数の和:16624

約数の個数: 36

約数和(自身を含む): 50907864

約数和(自身を除く): 29656024

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 16603, 33206, 66412, 83015, 132824, 166030, 265648, 332060, 531296, 664120, 1062592, 1328240, 2125184, 2656480, 4250368, 5312960, 10625920, 21251840]

約数ペア:

[(1, 21251840), (2, 10625920), (4, 5312960), (5, 4250368), (8, 2656480), (10, 2125184), (16, 1328240), (20, 1062592), (32, 664120), (40, 531296), (64, 332060), (80, 265648), (128, 166030), (160, 132824), (256, 83015), (320, 66412), (640, 33206), (1280, 16603)]