20732646 has 32 divisors (see below), whose sum is σ = 46096128. Its totient is φ = 6163040.

The previous prime is 20732627. The next prime is 20732689. The reversal of 20732646 is 64623702.

It is a super-2 number, since 2×20732646² = 859685220322632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (1440504).

Almost surely, 2^20732646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20732646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23048064).

20732646 is an abundant number, since it is smaller than the sum of its proper divisors (25363482).

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

20732646 is a wasteful number, since it uses less digits than its factorization.

20732646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5996.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 20732646 is about 4553.3115421636. The cubic root of 20732646 is about 274.7166050238.

The spelling of 20732646 in words is "twenty million, seven hundred thirty-two thousand, six hundred forty-six".