20870000 has 50 divisors (see below), whose sum is σ = 50552568. Its totient is φ = 8344000.

The previous prime is 20869987. The next prime is 20870023. The reversal of 20870000 is 7802.

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8957 + ... + 11043.

Almost surely, 2^20870000 is an apocalyptic number.

20870000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20870000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25276284).

20870000 is an abundant number, since it is smaller than the sum of its proper divisors (29682568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20870000 is an equidigital number, since it uses as much as digits as its factorization.

20870000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20870000 is about 4568.3695122002. The cubic root of 20870000 is about 275.3219370173.

Adding to 20870000 its reverse (7802), we get a palindrome (20877802).

The spelling of 20870000 in words is "twenty million, eight hundred seventy thousand".