20742663 has 8 divisors (see below), whose sum is σ = 28178928. Its totient is φ = 13567424.

The previous prime is 20742653. The next prime is 20742677. The reversal of 20742663 is 36624702.

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 20742663 - 2⁹ = 20742151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20742663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742643) 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, 65070 + ... + 65387.

It is an arithmetic number, because the mean of its divisors is an integer number (3522366).

Almost surely, 2^20742663 is an apocalyptic number.

20742663 is a deficient number, since it is larger than the sum of its proper divisors (7436265).

20742663 is a wasteful number, since it uses less digits than its factorization.

20742663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130513.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 20742663 is about 4554.4113779939. The cubic root of 20742663 is about 274.7608411071.

The spelling of 20742663 in words is "twenty million, seven hundred forty-two thousand, six hundred sixty-three".