20544545 has 16 divisors (see below), whose sum is σ = 28599168. Its totient is φ = 13875840.

The previous prime is 20544523. The next prime is 20544547. The reversal of 20544545 is 54544502.

It is not a de Polignac number, because 20544545 - 2⁶ = 20544481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20544547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2036 + ... + 6725.

It is an arithmetic number, because the mean of its divisors is an integer number (1787448).

Almost surely, 2^20544545 is an apocalyptic number.

It is an amenable number.

20544545 is a deficient number, since it is larger than the sum of its proper divisors (8054623).

20544545 is an equidigital number, since it uses as much as digits as its factorization.

20544545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840.

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 20544545 is about 4532.6090720467. The cubic root of 20544545 is about 273.8832729575.

The spelling of 20544545 in words is "twenty million, five hundred forty-four thousand, five hundred forty-five".