20464646 has 32 divisors (see below), whose sum is σ = 32997888. Its totient is φ = 9505440.

The previous prime is 20464643. The next prime is 20464657. The reversal of 20464646 is 64646402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464643) 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, 246521 + ... + 246603.

It is an arithmetic number, because the mean of its divisors is an integer number (1031184).

Almost surely, 2^20464646 is an apocalyptic number.

20464646 is a deficient number, since it is larger than the sum of its proper divisors (12533242).

20464646 is a wasteful number, since it uses less digits than its factorization.

20464646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 20464646 is about 4523.7866881629. The cubic root of 20464646 is about 273.5277620553.

The spelling of 20464646 in words is "twenty million, four hundred sixty-four thousand, six hundred forty-six".