28019915

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{281}}^1$

素因数の和:348

約数の個数: 48

約数和(自身を含む): 43978464

約数和(自身を除く): 15958549

約数列:

[1, 5, 7, 11, 35, 37, 49, 55, 77, 185, 245, 259, 281, 385, 407, 539, 1295, 1405, 1813, 1967, 2035, 2695, 2849, 3091, 9065, 9835, 10397, 13769, 14245, 15455, 19943, 21637, 51985, 68845, 72779, 99715, 108185, 114367, 151459, 363895, 509453, 571835, 757295, 800569, 2547265, 4002845, 5603983, 28019915]

約数ペア:

[(1, 28019915), (5, 5603983), (7, 4002845), (11, 2547265), (35, 800569), (37, 757295), (49, 571835), (55, 509453), (77, 363895), (185, 151459), (245, 114367), (259, 108185), (281, 99715), (385, 72779), (407, 68845), (539, 51985), (1295, 21637), (1405, 19943), (1813, 15455), (1967, 14245), (2035, 13769), (2695, 10397), (2849, 9835), (3091, 9065)]