20870003 has 16 divisors (see below), whose sum is σ = 26231040. Its totient is φ = 16130400.

The previous prime is 20869987. The next prime is 20870023. The reversal of 20870003 is 30007802.

It is not a de Polignac number, because 20870003 - 2⁴ = 20869987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20870023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9053 + ... + 11121.

It is an arithmetic number, because the mean of its divisors is an integer number (1639440).

Almost surely, 2^20870003 is an apocalyptic number.

20870003 is a deficient number, since it is larger than the sum of its proper divisors (5361037).

20870003 is a wasteful number, since it uses less digits than its factorization.

20870003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20870003 is about 4568.3698405449. The cubic root of 20870003 is about 275.3219502095.

Adding to 20870003 its reverse (30007802), we get a palindrome (50877805).

The spelling of 20870003 in words is "twenty million, eight hundred seventy thousand, three".