21289040

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{5021}}^1$

素因数の和:5087

約数の個数: 40

約数和(自身を含む): 50440968

約数和(自身を除く): 29151928

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 80, 106, 212, 265, 424, 530, 848, 1060, 2120, 4240, 5021, 10042, 20084, 25105, 40168, 50210, 80336, 100420, 200840, 266113, 401680, 532226, 1064452, 1330565, 2128904, 2661130, 4257808, 5322260, 10644520, 21289040]

約数ペア:

[(1, 21289040), (2, 10644520), (4, 5322260), (5, 4257808), (8, 2661130), (10, 2128904), (16, 1330565), (20, 1064452), (40, 532226), (53, 401680), (80, 266113), (106, 200840), (212, 100420), (265, 80336), (424, 50210), (530, 40168), (848, 25105), (1060, 20084), (2120, 10042), (4240, 5021)]