20573777979 has 48 divisors (see below), whose sum is σ = 32206766592. Its totient is φ = 13111525728.

The previous prime is 20573777947. The next prime is 20573778007. The reversal of 20573777979 is 97977737502.

It is not a de Polignac number, because 20573777979 - 2⁵ = 20573777947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20573770979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 470157 + ... + 512049.

It is an arithmetic number, because the mean of its divisors is an integer number (670974304).

Almost surely, 2^20573777979 is an apocalyptic number.

20573777979 is a deficient number, since it is larger than the sum of its proper divisors (11632988613).

20573777979 is an equidigital number, since it uses as much as digits as its factorization.

20573777979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41998 (or 41986 counting only the distinct ones).

The product of its (nonzero) digits is 40841010, while the sum is 63.

The spelling of 20573777979 in words is "twenty billion, five hundred seventy-three million, seven hundred seventy-seven thousand, nine hundred seventy-nine".