21493840

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6553}}^1$

素因数の和:6607

約数の個数: 40

約数和(自身を含む): 51199848

約数和(自身を除く): 29706008

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6553, 13106, 26212, 32765, 52424, 65530, 104848, 131060, 262120, 268673, 524240, 537346, 1074692, 1343365, 2149384, 2686730, 4298768, 5373460, 10746920, 21493840]

約数ペア:

[(1, 21493840), (2, 10746920), (4, 5373460), (5, 4298768), (8, 2686730), (10, 2149384), (16, 1343365), (20, 1074692), (40, 537346), (41, 524240), (80, 268673), (82, 262120), (164, 131060), (205, 104848), (328, 65530), (410, 52424), (656, 32765), (820, 26212), (1640, 13106), (3280, 6553)]