20457763 has 4 divisors (see below), whose sum is σ = 20470768. Its totient is φ = 20444760.

The previous prime is 20457751. The next prime is 20457791. The reversal of 20457763 is 36775402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36775402 = 2 ⋅18387701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20457763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20457733) 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, 3756 + ... + 7417.

It is an arithmetic number, because the mean of its divisors is an integer number (5117692).

Almost surely, 2^20457763 is an apocalyptic number.

20457763 is a deficient number, since it is larger than the sum of its proper divisors (13005).

20457763 is a wasteful number, since it uses less digits than its factorization.

20457763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13004.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 20457763 is about 4523.0258677129. The cubic root of 20457763 is about 273.4970928596.

The spelling of 20457763 in words is "twenty million, four hundred fifty-seven thousand, seven hundred sixty-three".