20519091 has 6 divisors (see below), whose sum is σ = 29638700. Its totient is φ = 13679388.

The previous prime is 20519077. The next prime is 20519099. The reversal of 20519091 is 19091502.

It is a happy number.

It is not a de Polignac number, because 20519091 - 2⁶ = 20519027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20519099) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139941 + ... + 1139958.

Almost surely, 2^20519091 is an apocalyptic number.

20519091 is a deficient number, since it is larger than the sum of its proper divisors (9119609).

20519091 is a wasteful number, since it uses less digits than its factorization.

20519091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279905 (or 2279902 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 20519091 is about 4529.8003267252. The cubic root of 20519091 is about 273.7701154919.

The spelling of 20519091 in words is "twenty million, five hundred nineteen thousand, ninety-one".