20128955

素因数分解:

$5^1\times 7^3\times {\mathrm{11}}^2\times {\mathrm{97}}^1$

素因数の和:145

約数の個数: 48

約数和(自身を含む): 31281600

約数和(自身を除く): 11152645

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 97, 121, 245, 343, 385, 485, 539, 605, 679, 847, 1067, 1715, 2695, 3395, 3773, 4235, 4753, 5335, 5929, 7469, 11737, 18865, 23765, 29645, 33271, 37345, 41503, 52283, 58685, 82159, 166355, 207515, 261415, 365981, 410795, 575113, 1829905, 2875565, 4025791, 20128955]

約数ペア:

[(1, 20128955), (5, 4025791), (7, 2875565), (11, 1829905), (35, 575113), (49, 410795), (55, 365981), (77, 261415), (97, 207515), (121, 166355), (245, 82159), (343, 58685), (385, 52283), (485, 41503), (539, 37345), (605, 33271), (679, 29645), (847, 23765), (1067, 18865), (1715, 11737), (2695, 7469), (3395, 5929), (3773, 5335), (4235, 4753)]