20742567 has 8 divisors (see below), whose sum is σ = 29283696. Its totient is φ = 13014912.

The previous prime is 20742563. The next prime is 20742581. The reversal of 20742567 is 76524702.

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

It is not a de Polignac number, because 20742567 - 2² = 20742563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742563) 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, 203308 + ... + 203409.

It is an arithmetic number, because the mean of its divisors is an integer number (3660462).

Almost surely, 2^20742567 is an apocalyptic number.

20742567 is a deficient number, since it is larger than the sum of its proper divisors (8541129).

20742567 is a wasteful number, since it uses less digits than its factorization.

20742567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406737.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 20742567 is about 4554.4008387493. The cubic root of 20742567 is about 274.7604172290.

The spelling of 20742567 in words is "twenty million, seven hundred forty-two thousand, five hundred sixty-seven".