20750657 has 8 divisors (see below), whose sum is σ = 21120000. Its totient is φ = 20384784.

The previous prime is 20750647. The next prime is 20750671. The reversal of 20750657 is 75605702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20750657 - 2⁶ = 20750593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20750627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13094 + ... + 14592.

It is an arithmetic number, because the mean of its divisors is an integer number (2640000).

Almost surely, 2^20750657 is an apocalyptic number.

It is an amenable number.

20750657 is a deficient number, since it is larger than the sum of its proper divisors (369343).

20750657 is a wasteful number, since it uses less digits than its factorization.

20750657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 20750657 is about 4555.2889041201. The cubic root of 20750657 is about 274.7961332015.

The spelling of 20750657 in words is "twenty million, seven hundred fifty thousand, six hundred fifty-seven".