20890007 has 4 divisors (see below), whose sum is σ = 20947296. Its totient is φ = 20832720.

The previous prime is 20889943. The next prime is 20890019. The reversal of 20890007 is 70009802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20890007 - 2⁶ = 20889943 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 (20890027) 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, 28094 + ... + 28827.

It is an arithmetic number, because the mean of its divisors is an integer number (5236824).

Almost surely, 2^20890007 is an apocalyptic number.

20890007 is a deficient number, since it is larger than the sum of its proper divisors (57289).

20890007 is an equidigital number, since it uses as much as digits as its factorization.

20890007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57288.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20890007 is about 4570.5587185814. The cubic root of 20890007 is about 275.4098879314.

Adding to 20890007 its reverse (70009802), we get a palindrome (90899809).

The spelling of 20890007 in words is "twenty million, eight hundred ninety thousand, seven".