21147405

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{127}}^1\times {\mathrm{653}}^1$

素因数の和:805

約数の個数: 32

約数和(自身を含む): 36163584

約数和(自身を除く): 15016179

約数列:

[1, 3, 5, 15, 17, 51, 85, 127, 255, 381, 635, 653, 1905, 1959, 2159, 3265, 6477, 9795, 10795, 11101, 32385, 33303, 55505, 82931, 166515, 248793, 414655, 1243965, 1409827, 4229481, 7049135, 21147405]

約数ペア:

[(1, 21147405), (3, 7049135), (5, 4229481), (15, 1409827), (17, 1243965), (51, 414655), (85, 248793), (127, 166515), (255, 82931), (381, 55505), (635, 33303), (653, 32385), (1905, 11101), (1959, 10795), (2159, 9795), (3265, 6477)]