20424736 has 24 divisors (see below), whose sum is σ = 41961024. Its totient is φ = 9768000.

The previous prime is 20424731. The next prime is 20424773. The reversal of 20424736 is 63742402.

It is not an unprimeable number, because it can be changed into a prime (20424731) 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, 13140 + ... + 14611.

It is an arithmetic number, because the mean of its divisors is an integer number (1748376).

Almost surely, 2^20424736 is an apocalyptic number.

It is an amenable number.

20424736 is an abundant number, since it is smaller than the sum of its proper divisors (21536288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20424736 is a wasteful number, since it uses less digits than its factorization.

20424736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27784 (or 27776 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20424736 is about 4519.3734078963. The cubic root of 20424736 is about 273.3498357410.

The spelling of 20424736 in words is "twenty million, four hundred twenty-four thousand, seven hundred thirty-six".