20830087 has 4 divisors (see below), whose sum is σ = 20839216. Its totient is φ = 20820960.

The previous prime is 20830067. The next prime is 20830133. The reversal of 20830087 is 78003802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78003802 = 2 ⋅39001901.

It is a cyclic number.

It is not a de Polignac number, because 20830087 - 2⁷ = 20829959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830027) 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, 2278 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (5209804).

Almost surely, 2^20830087 is an apocalyptic number.

20830087 is a deficient number, since it is larger than the sum of its proper divisors (9129).

20830087 is an equidigital number, since it uses as much as digits as its factorization.

20830087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20830087 is about 4563.9990140227. Note that the first 3 decimals coincide. The cubic root of 20830087 is about 275.1463111235.

Adding to 20830087 its reverse (78003802), we get a palindrome (98833889).

The spelling of 20830087 in words is "twenty million, eight hundred thirty thousand, eighty-seven".