20701567 has 4 divisors (see below), whose sum is σ = 20716960. Its totient is φ = 20686176.

The previous prime is 20701561. The next prime is 20701579. The reversal of 20701567 is 76510702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20701567 - 2¹¹ = 20699519 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 (20701561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5463 + ... + 8440.

It is an arithmetic number, because the mean of its divisors is an integer number (5179240).

Almost surely, 2^20701567 is an apocalyptic number.

20701567 is a deficient number, since it is larger than the sum of its proper divisors (15393).

20701567 is a wasteful number, since it uses less digits than its factorization.

20701567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15392.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 20701567 is about 4549.8974713723. The cubic root of 20701567 is about 274.5792662724.

The spelling of 20701567 in words is "twenty million, seven hundred one thousand, five hundred sixty-seven".