20919044 has 12 divisors (see below), whose sum is σ = 38761884. Its totient is φ = 9844224.

The previous prime is 20919037. The next prime is 20919049. The reversal of 20919044 is 44091902.

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 12334144 = 2930^2 + 3512^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20918998 and 20919016.

It is not an unprimeable number, because it can be changed into a prime (20919049) 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, 153749 + ... + 153884.

It is an arithmetic number, because the mean of its divisors is an integer number (3230157).

Almost surely, 2^20919044 is an apocalyptic number.

It is an amenable number.

20919044 is a deficient number, since it is larger than the sum of its proper divisors (17842840).

20919044 is a wasteful number, since it uses less digits than its factorization.

20919044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307654 (or 307652 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20919044 is about 4573.7341418145. The cubic root of 20919044 is about 275.5374349523.

The spelling of 20919044 in words is "twenty million, nine hundred nineteen thousand, forty-four".