20612047 has 4 divisors (see below), whose sum is σ = 20632536. Its totient is φ = 20591560.

The previous prime is 20612027. The next prime is 20612089. The reversal of 20612047 is 74021602.

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 20612047 - 2⁷ = 20611919 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 (20612027) 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, 8653 + ... + 10774.

It is an arithmetic number, because the mean of its divisors is an integer number (5158134).

Almost surely, 2^20612047 is an apocalyptic number.

20612047 is a deficient number, since it is larger than the sum of its proper divisors (20489).

20612047 is a wasteful number, since it uses less digits than its factorization.

20612047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20488.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20612047 is about 4540.0492288080. The cubic root of 20612047 is about 274.1829057412.

Adding to 20612047 its reverse (74021602), we get a palindrome (94633649).

The spelling of 20612047 in words is "twenty million, six hundred twelve thousand, forty-seven".