20265634 has 4 divisors (see below), whose sum is σ = 30398454. Its totient is φ = 10132816.

The previous prime is 20265629. The next prime is 20265667. The reversal of 20265634 is 43656202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43656202 = 2 ⋅21828101.

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 418609 = 4455^2 + 647^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5066407 + ... + 5066410.

Almost surely, 2^20265634 is an apocalyptic number.

20265634 is a deficient number, since it is larger than the sum of its proper divisors (10132820).

20265634 is a wasteful number, since it uses less digits than its factorization.

20265634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10132819.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20265634 is about 4501.7367759566. The cubic root of 20265634 is about 272.6382162223.

The spelling of 20265634 in words is "twenty million, two hundred sixty-five thousand, six hundred thirty-four".