Search a number
-
+
20525531 = 1310315329
BaseRepresentation
bin100111001001…
…1000111011011
31102121210201212
41032103013123
520223304111
62011533335
7336315125
oct116230733
942553655
1020525531
111064a154
126a5a24b
1343386b0
142a24215
151c0698b
hex13931db

20525531 has 8 divisors (see below), whose sum is σ = 22320480. Its totient is φ = 18761472.

The previous prime is 20525521. The next prime is 20525539. The reversal of 20525531 is 13552502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20525531 - 214 = 20509147 is a prime.

It is a super-2 number, since 2×205255312 = 842594845663922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20525497 and 20525506.

It is not an unprimeable number, because it can be changed into a prime (20525539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6326 + ... + 9003.

It is an arithmetic number, because the mean of its divisors is an integer number (2790060).

Almost surely, 220525531 is an apocalyptic number.

20525531 is a deficient number, since it is larger than the sum of its proper divisors (1794949).

20525531 is a wasteful number, since it uses less digits than its factorization.

20525531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15445.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 20525531 is about 4530.5111190681. The cubic root of 20525531 is about 273.7987537834.

The spelling of 20525531 in words is "twenty million, five hundred twenty-five thousand, five hundred thirty-one".

Divisors: 1 13 103 1339 15329 199277 1578887 20525531