20739697 has 8 divisors (see below), whose sum is σ = 23816160. Its totient is φ = 17861760.

The previous prime is 20739689. The next prime is 20739701. The reversal of 20739697 is 79693702.

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 20739697 - 2³ = 20739689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20739617) 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, 49408 + ... + 49825.

It is an arithmetic number, because the mean of its divisors is an integer number (2977020).

Almost surely, 2^20739697 is an apocalyptic number.

It is an amenable number.

20739697 is a deficient number, since it is larger than the sum of its proper divisors (3076463).

20739697 is a wasteful number, since it uses less digits than its factorization.

20739697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99263.

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 20739697 is about 4554.0857479850. The cubic root of 20739697 is about 274.7477444361.

The spelling of 20739697 in words is "twenty million, seven hundred thirty-nine thousand, six hundred ninety-seven".