20505822477 has 32 divisors (see below), whose sum is σ = 33270988800. Its totient is φ = 11208138480.

The previous prime is 20505822473. The next prime is 20505822479. The reversal of 20505822477 is 77422850502.

It is not a de Polignac number, because 20505822477 - 2² = 20505822473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505822473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409549 + ... + 456882.

It is an arithmetic number, because the mean of its divisors is an integer number (1039718400).

Almost surely, 2^20505822477 is an apocalyptic number.

It is an amenable number.

20505822477 is a deficient number, since it is larger than the sum of its proper divisors (12765166323).

20505822477 is an equidigital number, since it uses as much as digits as its factorization.

20505822477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866478 (or 866464 counting only the distinct ones).

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

The spelling of 20505822477 in words is "twenty billion, five hundred five million, eight hundred twenty-two thousand, four hundred seventy-seven".