20039897 has 4 divisors (see below), whose sum is σ = 20140800. Its totient is φ = 19938996.

The previous prime is 20039893. The next prime is 20039933. The reversal of 20039897 is 79893002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20039897 - 2² = 20039893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20039897.

It is not an unprimeable number, because it can be changed into a prime (20039891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50153 + ... + 50550.

It is an arithmetic number, because the mean of its divisors is an integer number (5035200).

Almost surely, 2^20039897 is an apocalyptic number.

It is an amenable number.

20039897 is a deficient number, since it is larger than the sum of its proper divisors (100903).

20039897 is a wasteful number, since it uses less digits than its factorization.

20039897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100902.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20039897 is about 4476.5943528535. The cubic root of 20039897 is about 271.6221369715.

The spelling of 20039897 in words is "twenty million, thirty-nine thousand, eight hundred ninety-seven".