20249107977 has 16 divisors (see below), whose sum is σ = 32197340160. Its totient is φ = 11067835152.

The previous prime is 20249107969. The next prime is 20249107981. The reversal of 20249107977 is 77970194202.

It is not a de Polignac number, because 20249107977 - 2³ = 20249107969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20249107477) 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, 20961327 + ... + 20962292.

It is an arithmetic number, because the mean of its divisors is an integer number (2012333760).

Almost surely, 2^20249107977 is an apocalyptic number.

It is an amenable number.

20249107977 is a deficient number, since it is larger than the sum of its proper divisors (11948232183).

20249107977 is a wasteful number, since it uses less digits than its factorization.

20249107977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41923652.

The product of its (nonzero) digits is 444528, while the sum is 48.

The spelling of 20249107977 in words is "twenty billion, two hundred forty-nine million, one hundred seven thousand, nine hundred seventy-seven".