20647376 has 40 divisors (see below), whose sum is σ = 43955520. Its totient is φ = 9351936.

The previous prime is 20647351. The next prime is 20647387. The reversal of 20647376 is 67374602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5516 + ... + 8468.

It is an arithmetic number, because the mean of its divisors is an integer number (1098888).

Almost surely, 2^20647376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20647376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21977760).

20647376 is an abundant number, since it is smaller than the sum of its proper divisors (23308144).

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

20647376 is a wasteful number, since it uses less digits than its factorization.

20647376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003 (or 2997 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 20647376 is about 4543.9383798639. The cubic root of 20647376 is about 274.3394659454.

The spelling of 20647376 in words is "twenty million, six hundred forty-seven thousand, three hundred seventy-six".