20757007 has 8 divisors (see below), whose sum is σ = 21090816. Its totient is φ = 20426112.

The previous prime is 20757001. The next prime is 20757031. The reversal of 20757007 is 70075702.

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 20757007 - 2²³ = 12368399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20757001) 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, 16803 + ... + 17995.

It is an arithmetic number, because the mean of its divisors is an integer number (2636352).

Almost surely, 2^20757007 is an apocalyptic number.

20757007 is a deficient number, since it is larger than the sum of its proper divisors (333809).

20757007 is a wasteful number, since it uses less digits than its factorization.

20757007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 3430, while the sum is 28.

The square root of 20757007 is about 4555.9858428226. The cubic root of 20757007 is about 274.8241608680.

The spelling of 20757007 in words is "twenty million, seven hundred fifty-seven thousand, seven".