21642921

素因数分解:

$3^2\times {\mathrm{17}}^2\times {\mathrm{53}}^1\times {\mathrm{157}}^1$

素因数の和:250

約数の個数: 36

約数和(自身を含む): 34051212

約数和(自身を除く): 12408291

約数列:

[1, 3, 9, 17, 51, 53, 153, 157, 159, 289, 471, 477, 867, 901, 1413, 2601, 2669, 2703, 8007, 8109, 8321, 15317, 24021, 24963, 45373, 45951, 74889, 136119, 137853, 141457, 408357, 424371, 1273113, 2404769, 7214307, 21642921]

約数ペア:

[(1, 21642921), (3, 7214307), (9, 2404769), (17, 1273113), (51, 424371), (53, 408357), (153, 141457), (157, 137853), (159, 136119), (289, 74889), (471, 45951), (477, 45373), (867, 24963), (901, 24021), (1413, 15317), (2601, 8321), (2669, 8109), (2703, 8007)]