20339660 has 48 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 7266240.

The previous prime is 20339653. The next prime is 20339663. The reversal of 20339660 is 6693302.

It is not an unprimeable number, because it can be changed into a prime (20339663) 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, 12197 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (987840).

Almost surely, 2^20339660 is an apocalyptic number.

20339660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20339660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23708160).

20339660 is an abundant number, since it is smaller than the sum of its proper divisors (27076660).

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

20339660 is a wasteful number, since it uses less digits than its factorization.

20339660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1644 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20339660 is about 4509.9512192484. The cubic root of 20339660 is about 272.9697757556.

The spelling of 20339660 in words is "twenty million, three hundred thirty-nine thousand, six hundred sixty".