20870837 has 8 divisors (see below), whose sum is σ = 22858080. Its totient is φ = 18938160.

The previous prime is 20870813. The next prime is 20870869. The reversal of 20870837 is 73807802.

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 20870837 - 2²² = 16676533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20870797 and 20870806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870887) 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, 12839 + ... + 14372.

It is an arithmetic number, because the mean of its divisors is an integer number (2857260).

Almost surely, 2^20870837 is an apocalyptic number.

It is an amenable number.

20870837 is a deficient number, since it is larger than the sum of its proper divisors (1987243).

20870837 is a wasteful number, since it uses less digits than its factorization.

20870837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27283.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20870837 is about 4568.4611194581. The cubic root of 20870837 is about 275.3256176015.

The spelling of 20870837 in words is "twenty million, eight hundred seventy thousand, eight hundred thirty-seven".