20636545 has 16 divisors (see below), whose sum is σ = 26449920. Its totient is φ = 15422400.

The previous prime is 20636513. The next prime is 20636549. The reversal of 20636545 is 54563602.

It is not a de Polignac number, because 20636545 - 2⁵ = 20636513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (20636549) 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, 2200 + ... + 6790.

It is an arithmetic number, because the mean of its divisors is an integer number (1653120).

Almost surely, 2^20636545 is an apocalyptic number.

It is an amenable number.

20636545 is a deficient number, since it is larger than the sum of its proper divisors (5813375).

20636545 is a wasteful number, since it uses less digits than its factorization.

20636545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20636545 is about 4542.7464159911. The cubic root of 20636545 is about 274.2914874441.

The spelling of 20636545 in words is "twenty million, six hundred thirty-six thousand, five hundred forty-five".