20520582477 has 16 divisors (see below), whose sum is σ = 27432471552. Its totient is φ = 13644575280.

The previous prime is 20520582473. The next prime is 20520582493. The reversal of 20520582477 is 77428502502.

It is not a de Polignac number, because 20520582477 - 2² = 20520582473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520582473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3631068 + ... + 3636714.

It is an arithmetic number, because the mean of its divisors is an integer number (1714529472).

Almost surely, 2^20520582477 is an apocalyptic number.

It is an amenable number.

20520582477 is a deficient number, since it is larger than the sum of its proper divisors (6911889075).

20520582477 is a wasteful number, since it uses less digits than its factorization.

20520582477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8608.

The product of its (nonzero) digits is 313600, while the sum is 42.

The spelling of 20520582477 in words is "twenty billion, five hundred twenty million, five hundred eighty-two thousand, four hundred seventy-seven".