20942537 has 8 divisors (see below), whose sum is σ = 26110272. Its totient is φ = 16318800.

The previous prime is 20942527. The next prime is 20942557. The reversal of 20942537 is 73524902.

It is a happy number.

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 20942537 - 2¹⁴ = 20926153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20942507) 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, 135914 + ... + 136067.

It is an arithmetic number, because the mean of its divisors is an integer number (3263784).

Almost surely, 2^20942537 is an apocalyptic number.

It is an amenable number.

20942537 is a deficient number, since it is larger than the sum of its proper divisors (5167735).

20942537 is a wasteful number, since it uses less digits than its factorization.

20942537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271999.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20942537 is about 4576.3016727484. The cubic root of 20942537 is about 275.6405432212.

The spelling of 20942537 in words is "twenty million, nine hundred forty-two thousand, five hundred thirty-seven".