20557650273 has 4 divisors (see below), whose sum is σ = 27410200368. Its totient is φ = 13705100180.

The previous prime is 20557650271. The next prime is 20557650287. The reversal of 20557650273 is 37205675502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20557650273 - 2¹ = 20557650271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20557650271) 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, 3426275043 + ... + 3426275048.

It is an arithmetic number, because the mean of its divisors is an integer number (6852550092).

Almost surely, 2^20557650273 is an apocalyptic number.

It is an amenable number.

20557650273 is a deficient number, since it is larger than the sum of its proper divisors (6852550095).

20557650273 is an equidigital number, since it uses as much as digits as its factorization.

20557650273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6852550094.

The product of its (nonzero) digits is 441000, while the sum is 42.

The spelling of 20557650273 in words is "twenty billion, five hundred fifty-seven million, six hundred fifty thousand, two hundred seventy-three".