21457475

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{641}}^1$

素因数の和:767

約数の個数: 24

約数和(自身を含む): 28977312

約数和(自身を除く): 7519837

約数列:

[1, 5, 13, 25, 65, 103, 325, 515, 641, 1339, 2575, 3205, 6695, 8333, 16025, 33475, 41665, 66023, 208325, 330115, 858299, 1650575, 4291495, 21457475]

約数ペア:

[(1, 21457475), (5, 4291495), (13, 1650575), (25, 858299), (65, 330115), (103, 208325), (325, 66023), (515, 41665), (641, 33475), (1339, 16025), (2575, 8333), (3205, 6695)]