20641670 has 32 divisors (see below), whose sum is σ = 42806016. Its totient is φ = 7020000.

The previous prime is 20641669. The next prime is 20641679. The reversal of 20641670 is 7614602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641679) 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, 8045 + ... + 10295.

It is an arithmetic number, because the mean of its divisors is an integer number (1337688).

Almost surely, 2^20641670 is an apocalyptic number.

20641670 is an abundant number, since it is smaller than the sum of its proper divisors (22164346).

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

20641670 is a wasteful number, since it uses less digits than its factorization.

20641670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20641670 is about 4543.3104670493. The cubic root of 20641670 is about 274.3141919475.

The spelling of 20641670 in words is "twenty million, six hundred forty-one thousand, six hundred seventy".