20697137 has 8 divisors (see below), whose sum is σ = 21830400. Its totient is φ = 19568304.

The previous prime is 20697133. The next prime is 20697151. The reversal of 20697137 is 73179602.

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 20697137 - 2² = 20697133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20697097 and 20697106.

It is not an unprimeable number, because it can be changed into a prime (20697133) 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, 13664 + ... + 15102.

It is an arithmetic number, because the mean of its divisors is an integer number (2728800).

Almost surely, 2^20697137 is an apocalyptic number.

It is an amenable number.

20697137 is a deficient number, since it is larger than the sum of its proper divisors (1133263).

20697137 is a wasteful number, since it uses less digits than its factorization.

20697137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20697137 is about 4549.4106211684. The cubic root of 20697137 is about 274.5596788192.

The spelling of 20697137 in words is "twenty million, six hundred ninety-seven thousand, one hundred thirty-seven".