21178345

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1\times {\mathrm{103}}^1$

素因数の和:225

約数の個数: 32

約数和(自身を含む): 28304640

約数和(自身を除く): 7126295

約数列:

[1, 5, 17, 41, 59, 85, 103, 205, 295, 515, 697, 1003, 1751, 2419, 3485, 4223, 5015, 6077, 8755, 12095, 21115, 30385, 41123, 71791, 103309, 205615, 249157, 358955, 516545, 1245785, 4235669, 21178345]

約数ペア:

[(1, 21178345), (5, 4235669), (17, 1245785), (41, 516545), (59, 358955), (85, 249157), (103, 205615), (205, 103309), (295, 71791), (515, 41123), (697, 30385), (1003, 21115), (1751, 12095), (2419, 8755), (3485, 6077), (4223, 5015)]