21878720

素因数分解:

$2^6\times 5^1\times {\mathrm{68371}}^1$

素因数の和:68388

約数の個数: 28

約数和(自身を含む): 52099464

約数和(自身を除く): 30220744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 68371, 136742, 273484, 341855, 546968, 683710, 1093936, 1367420, 2187872, 2734840, 4375744, 5469680, 10939360, 21878720]

約数ペア:

[(1, 21878720), (2, 10939360), (4, 5469680), (5, 4375744), (8, 2734840), (10, 2187872), (16, 1367420), (20, 1093936), (32, 683710), (40, 546968), (64, 341855), (80, 273484), (160, 136742), (320, 68371)]