20264647 has 4 divisors (see below), whose sum is σ = 21823480. Its totient is φ = 18705816.

The previous prime is 20264609. The next prime is 20264689. The reversal of 20264647 is 74646202.

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

It is a cyclic number.

It is not a de Polignac number, because 20264647 - 2¹⁹ = 19740359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779397 + ... + 779422.

It is an arithmetic number, because the mean of its divisors is an integer number (5455870).

Almost surely, 2^20264647 is an apocalyptic number.

20264647 is a deficient number, since it is larger than the sum of its proper divisors (1558833).

20264647 is a wasteful number, since it uses less digits than its factorization.

20264647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558832.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20264647 is about 4501.6271502647. The cubic root of 20264647 is about 272.6337900381.

The spelling of 20264647 in words is "twenty million, two hundred sixty-four thousand, six hundred forty-seven".