20544905 has 8 divisors (see below), whose sum is σ = 25504200. Its totient is φ = 15869056.

The previous prime is 20544899. The next prime is 20544929. The reversal of 20544905 is 50944502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4376464 + 16168441 = 2092^2 + 4021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20544905 - 2⁴ = 20544889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70700 + ... + 70989.

It is an arithmetic number, because the mean of its divisors is an integer number (3188025).

Almost surely, 2^20544905 is an apocalyptic number.

It is an amenable number.

20544905 is a deficient number, since it is larger than the sum of its proper divisors (4959295).

20544905 is a wasteful number, since it uses less digits than its factorization.

20544905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141723.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20544905 is about 4532.6487840996. The cubic root of 20544905 is about 273.8848726912.

The spelling of 20544905 in words is "twenty million, five hundred forty-four thousand, nine hundred five".