20878165

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{127}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 32569344

約数和(自身を除く): 11691179

約数列:

[1, 5, 7, 11, 35, 49, 55, 61, 77, 127, 245, 305, 385, 427, 539, 635, 671, 889, 1397, 2135, 2695, 2989, 3355, 4445, 4697, 6223, 6985, 7747, 9779, 14945, 23485, 31115, 32879, 38735, 48895, 54229, 68453, 85217, 164395, 271145, 342265, 379603, 426085, 596519, 1898015, 2982595, 4175633, 20878165]

約数ペア:

[(1, 20878165), (5, 4175633), (7, 2982595), (11, 1898015), (35, 596519), (49, 426085), (55, 379603), (61, 342265), (77, 271145), (127, 164395), (245, 85217), (305, 68453), (385, 54229), (427, 48895), (539, 38735), (635, 32879), (671, 31115), (889, 23485), (1397, 14945), (2135, 9779), (2695, 7747), (2989, 6985), (3355, 6223), (4445, 4697)]