20739670 has 32 divisors (see below), whose sum is σ = 43156800. Its totient is φ = 7028736.

The previous prime is 20739661. The next prime is 20739671. The reversal of 20739670 is 7693702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20739671) 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, 4566 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (1348650).

Almost surely, 2^20739670 is an apocalyptic number.

20739670 is an abundant number, since it is smaller than the sum of its proper divisors (22417130).

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

20739670 is a wasteful number, since it uses less digits than its factorization.

20739670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 20739670 is about 4554.0827836130. The cubic root of 20739670 is about 274.7476252091.

The spelling of 20739670 in words is "twenty million, seven hundred thirty-nine thousand, six hundred seventy".