20673657 has 16 divisors (see below), whose sum is σ = 31207680. Its totient is φ = 13521456.

The previous prime is 20673647. The next prime is 20673671. The reversal of 20673657 is 75637602.

It is a happy number.

It is not a de Polignac number, because 20673657 - 2⁶ = 20673593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20673617) 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, 5793 + ... + 8654.

It is an arithmetic number, because the mean of its divisors is an integer number (1950480).

Almost surely, 2^20673657 is an apocalyptic number.

20673657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20673657 is a deficient number, since it is larger than the sum of its proper divisors (10534023).

20673657 is a wasteful number, since it uses less digits than its factorization.

20673657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14509 (or 14503 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 20673657 is about 4546.8293348222. The cubic root of 20673657 is about 274.4558142023.

The spelling of 20673657 in words is "twenty million, six hundred seventy-three thousand, six hundred fifty-seven".