20632645 has 16 divisors (see below), whose sum is σ = 28600128. Its totient is φ = 14122240.

The previous prime is 20632637. The next prime is 20632649. The reversal of 20632645 is 54623602.

It is a happy number.

It is not a de Polignac number, because 20632645 - 2³ = 20632637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20632649) 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, 10099 + ... + 11968.

It is an arithmetic number, because the mean of its divisors is an integer number (1787508).

Almost surely, 2^20632645 is an apocalyptic number.

It is an amenable number.

20632645 is a deficient number, since it is larger than the sum of its proper divisors (7967483).

20632645 is a wasteful number, since it uses less digits than its factorization.

20632645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22100.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20632645 is about 4542.3171399628. The cubic root of 20632645 is about 274.2742073520.

The spelling of 20632645 in words is "twenty million, six hundred thirty-two thousand, six hundred forty-five".