20477637533 has 4 divisors (see below), whose sum is σ = 20569465728. Its totient is φ = 20385809340.

The previous prime is 20477637529. The next prime is 20477637553. The reversal of 20477637533 is 33573677402.

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 not a de Polignac number, because 20477637533 - 2² = 20477637529 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 (20477637553) 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, 45913763 + ... + 45914208.

It is an arithmetic number, because the mean of its divisors is an integer number (5142366432).

Almost surely, 2^20477637533 is an apocalyptic number.

It is an amenable number.

20477637533 is a deficient number, since it is larger than the sum of its proper divisors (91828195).

20477637533 is an equidigital number, since it uses as much as digits as its factorization.

20477637533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91828194.

The product of its (nonzero) digits is 2222640, while the sum is 47.

The spelling of 20477637533 in words is "twenty billion, four hundred seventy-seven million, six hundred thirty-seven thousand, five hundred thirty-three".