20523634 has 4 divisors (see below), whose sum is σ = 30785454. Its totient is φ = 10261816.

The previous prime is 20523623. The next prime is 20523649. The reversal of 20523634 is 43632502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 1575025 = 4353^2 + 1255^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20523599 and 20523608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130907 + ... + 5130910.

Almost surely, 2^20523634 is an apocalyptic number.

20523634 is a deficient number, since it is larger than the sum of its proper divisors (10261820).

20523634 is a wasteful number, since it uses less digits than its factorization.

20523634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10261819.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20523634 is about 4530.3017559540. The cubic root of 20523634 is about 273.7903185613.

The spelling of 20523634 in words is "twenty million, five hundred twenty-three thousand, six hundred thirty-four".