20544919 has 4 divisors (see below), whose sum is σ = 20575944. Its totient is φ = 20513896.

The previous prime is 20544899. The next prime is 20544929. The reversal of 20544919 is 91944502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20544919 - 2⁷ = 20544791 is a prime.

It is a super-2 number, since 2×20544919² = 844187393433122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544929) 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, 14497 + ... + 15850.

It is an arithmetic number, because the mean of its divisors is an integer number (5143986).

Almost surely, 2^20544919 is an apocalyptic number.

20544919 is a deficient number, since it is larger than the sum of its proper divisors (31025).

20544919 is an equidigital number, since it uses as much as digits as its factorization.

20544919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31024.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20544919 is about 4532.6503284502. The cubic root of 20544919 is about 273.8849349027.

The spelling of 20544919 in words is "twenty million, five hundred forty-four thousand, nine hundred nineteen".