20625231 has 8 divisors (see below), whose sum is σ = 30000384. Its totient is φ = 12500120.

The previous prime is 20625217. The next prime is 20625239. The reversal of 20625231 is 13252602.

20625231 = T₁₉₃₁ + T₁₉₃₂ + ... + T₁₉₄₁.

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 20625231 - 2⁷ = 20625103 is a prime.

It is a super-2 number, since 2×20625231² = 850800307606722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20625198 and 20625207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625239) 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, 312471 + ... + 312536.

It is an arithmetic number, because the mean of its divisors is an integer number (3750048).

Almost surely, 2^20625231 is an apocalyptic number.

20625231 is a deficient number, since it is larger than the sum of its proper divisors (9375153).

20625231 is a wasteful number, since it uses less digits than its factorization.

20625231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625021.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20625231 is about 4541.5009633380. The cubic root of 20625231 is about 274.2413514484.

Adding to 20625231 its reverse (13252602), we get a palindrome (33877833).

The spelling of 20625231 in words is "twenty million, six hundred twenty-five thousand, two hundred thirty-one".