20047477 has 4 divisors (see below), whose sum is σ = 20137600. Its totient is φ = 19957356.

The previous prime is 20047453. The next prime is 20047493. The reversal of 20047477 is 77474002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20047477 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 (20047177) 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, 44727 + ... + 45172.

It is an arithmetic number, because the mean of its divisors is an integer number (5034400).

Almost surely, 2^20047477 is an apocalyptic number.

It is an amenable number.

20047477 is a deficient number, since it is larger than the sum of its proper divisors (90123).

20047477 is an equidigital number, since it uses as much as digits as its factorization.

20047477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90122.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20047477 is about 4477.4408985491. The cubic root of 20047477 is about 271.6563792676.

The spelling of 20047477 in words is "twenty million, forty-seven thousand, four hundred seventy-seven".