21205425

素因数分解:

$3^1\times 5^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{647}}^1$

素因数の和:702

約数の個数: 48

約数和(自身を含む): 38568960

約数和(自身を除く): 17363535

約数列:

[1, 3, 5, 15, 19, 23, 25, 57, 69, 75, 95, 115, 285, 345, 437, 475, 575, 647, 1311, 1425, 1725, 1941, 2185, 3235, 6555, 9705, 10925, 12293, 14881, 16175, 32775, 36879, 44643, 48525, 61465, 74405, 184395, 223215, 282739, 307325, 372025, 848217, 921975, 1116075, 1413695, 4241085, 7068475, 21205425]

約数ペア:

[(1, 21205425), (3, 7068475), (5, 4241085), (15, 1413695), (19, 1116075), (23, 921975), (25, 848217), (57, 372025), (69, 307325), (75, 282739), (95, 223215), (115, 184395), (285, 74405), (345, 61465), (437, 48525), (475, 44643), (575, 36879), (647, 32775), (1311, 16175), (1425, 14881), (1725, 12293), (1941, 10925), (2185, 9705), (3235, 6555)]