20573773109 has 4 divisors (see below), whose sum is σ = 20911048140. Its totient is φ = 20236498080.

The previous prime is 20573773057. The next prime is 20573773111. The reversal of 20573773109 is 90137737502.

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 5043130225 + 15530642884 = 71015^2 + 124622^2 .

It is a cyclic number.

It is not a de Polignac number, because 20573773109 - 2⁸ = 20573772853 is a prime.

It is a super-2 number, since 2×20573773109² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20573773109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20573773189) 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, 168637424 + ... + 168637545.

It is an arithmetic number, because the mean of its divisors is an integer number (5227762035).

Almost surely, 2^20573773109 is an apocalyptic number.

It is an amenable number.

20573773109 is a deficient number, since it is larger than the sum of its proper divisors (337275031).

20573773109 is an equidigital number, since it uses as much as digits as its factorization.

20573773109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337275030.

The product of its (nonzero) digits is 277830, while the sum is 44.

The spelling of 20573773109 in words is "twenty billion, five hundred seventy-three million, seven hundred seventy-three thousand, one hundred nine".