21027280

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3923}}^1$

素因数の和:4003

約数の個数: 40

約数和(自身を含む): 49630752

約数和(自身を除く): 28603472

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3923, 5360, 7846, 15692, 19615, 31384, 39230, 62768, 78460, 156920, 262841, 313840, 525682, 1051364, 1314205, 2102728, 2628410, 4205456, 5256820, 10513640, 21027280]

約数ペア:

[(1, 21027280), (2, 10513640), (4, 5256820), (5, 4205456), (8, 2628410), (10, 2102728), (16, 1314205), (20, 1051364), (40, 525682), (67, 313840), (80, 262841), (134, 156920), (268, 78460), (335, 62768), (536, 39230), (670, 31384), (1072, 19615), (1340, 15692), (2680, 7846), (3923, 5360)]