20263337477 has 4 divisors (see below), whose sum is σ = 20265155820. Its totient is φ = 20261519136.

The previous prime is 20263337441. The next prime is 20263337489. The reversal of 20263337477 is 77473336202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5863577476 + 14399760001 = 76574^2 + 119999^2 .

It is a cyclic number.

It is not a de Polignac number, because 20263337477 - 2¹² = 20263333381 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 (20263337377) 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, 892352 + ... + 914777.

It is an arithmetic number, because the mean of its divisors is an integer number (5066288955).

Almost surely, 2^20263337477 is an apocalyptic number.

It is an amenable number.

20263337477 is a deficient number, since it is larger than the sum of its proper divisors (1818343).

20263337477 is a wasteful number, since it uses less digits than its factorization.

20263337477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818342.

The product of its (nonzero) digits is 889056, while the sum is 44.

The spelling of 20263337477 in words is "twenty billion, two hundred sixty-three million, three hundred thirty-seven thousand, four hundred seventy-seven".