20662647 has 16 divisors (see below), whose sum is σ = 29137920. Its totient is φ = 13003200.

The previous prime is 20662643. The next prime is 20662693. The reversal of 20662647 is 74626602.

It is not a de Polignac number, because 20662647 - 2² = 20662643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662643) 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, 1104 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (1821120).

Almost surely, 2^20662647 is an apocalyptic number.

20662647 is a deficient number, since it is larger than the sum of its proper divisors (8475273).

20662647 is a wasteful number, since it uses less digits than its factorization.

20662647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5494.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20662647 is about 4545.6184397725. The cubic root of 20662647 is about 274.4070839898.

The spelling of 20662647 in words is "twenty million, six hundred sixty-two thousand, six hundred forty-seven".