21778275

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1$

素因数の和:109

約数の個数: 96

約数和(自身を含む): 42854400

約数和(自身を除く): 21076125

約数列:

[1, 3, 5, 15, 17, 19, 25, 29, 31, 51, 57, 75, 85, 87, 93, 95, 145, 155, 255, 285, 323, 425, 435, 465, 475, 493, 527, 551, 589, 725, 775, 899, 969, 1275, 1425, 1479, 1581, 1615, 1653, 1767, 2175, 2325, 2465, 2635, 2697, 2755, 2945, 4495, 4845, 7395, 7905, 8075, 8265, 8835, 9367, 10013, 12325, 13175, 13485, 13775, 14725, 15283, 17081, 22475, 24225, 28101, 30039, 36975, 39525, 41325, 44175, 45849, 46835, 50065, 51243, 67425, 76415, 85405, 140505, 150195, 229245, 234175, 250325, 256215, 290377, 382075, 427025, 702525, 750975, 871131, 1146225, 1281075, 1451885, 4355655, 7259425, 21778275]

約数ペア:

[(1, 21778275), (3, 7259425), (5, 4355655), (15, 1451885), (17, 1281075), (19, 1146225), (25, 871131), (29, 750975), (31, 702525), (51, 427025), (57, 382075), (75, 290377), (85, 256215), (87, 250325), (93, 234175), (95, 229245), (145, 150195), (155, 140505), (255, 85405), (285, 76415), (323, 67425), (425, 51243), (435, 50065), (465, 46835), (475, 45849), (493, 44175), (527, 41325), (551, 39525), (589, 36975), (725, 30039), (775, 28101), (899, 24225), (969, 22475), (1275, 17081), (1425, 15283), (1479, 14725), (1581, 13775), (1615, 13485), (1653, 13175), (1767, 12325), (2175, 10013), (2325, 9367), (2465, 8835), (2635, 8265), (2697, 8075), (2755, 7905), (2945, 7395), (4495, 4845)]