20739660 has 48 divisors (see below), whose sum is σ = 61490016. Its totient is φ = 5204992.

The previous prime is 20739619. The next prime is 20739661. The reversal of 20739660 is 6693702.

It is not an unprimeable number, because it can be changed into a prime (20739661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9147 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (1281042).

Almost surely, 2^20739660 is an apocalyptic number.

20739660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20739660 is an abundant number, since it is smaller than the sum of its proper divisors (40750356).

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

20739660 is a wasteful number, since it uses less digits than its factorization.

20739660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20362 (or 20360 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 20739660 is about 4554.0816856969. The cubic root of 20739660 is about 274.7475810510.

The spelling of 20739660 in words is "twenty million, seven hundred thirty-nine thousand, six hundred sixty".