20919051 has 12 divisors (see below), whose sum is σ = 30259320. Its totient is φ = 13926240.

The previous prime is 20919049. The next prime is 20919109. The reversal of 20919051 is 15091902.

It is a happy number.

It is not a de Polignac number, because 20919051 - 2¹ = 20919049 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20919001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8031 + ... + 10311.

It is an arithmetic number, because the mean of its divisors is an integer number (2521610).

Almost surely, 2^20919051 is an apocalyptic number.

20919051 is a deficient number, since it is larger than the sum of its proper divisors (9340269).

20919051 is a wasteful number, since it uses less digits than its factorization.

20919051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306 (or 3303 counting only the distinct ones).

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

The square root of 20919051 is about 4573.7349070535. The cubic root of 20919051 is about 275.5374656860.

The spelling of 20919051 in words is "twenty million, nine hundred nineteen thousand, fifty-one".