20102757 has 4 divisors (see below), whose sum is σ = 26803680. Its totient is φ = 13401836.

The previous prime is 20102743. The next prime is 20102807. The reversal of 20102757 is 75720102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20102757 - 2¹¹ = 20100709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3350457 + ... + 3350462.

It is an arithmetic number, because the mean of its divisors is an integer number (6700920).

Almost surely, 2^20102757 is an apocalyptic number.

It is an amenable number.

20102757 is a deficient number, since it is larger than the sum of its proper divisors (6700923).

20102757 is an equidigital number, since it uses as much as digits as its factorization.

20102757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700922.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20102757 is about 4483.6098179926. The cubic root of 20102757 is about 271.9058434554.

Adding to 20102757 its reverse (75720102), we get a palindrome (95822859).

The spelling of 20102757 in words is "twenty million, one hundred two thousand, seven hundred fifty-seven".