20950000 has 60 divisors (see below), whose sum is σ = 50856120. Its totient is φ = 8360000.

The previous prime is 20949997. The next prime is 20950009. The reversal of 20950000 is 5902.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20950009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49791 + ... + 50209.

It is an arithmetic number, because the mean of its divisors is an integer number (847602).

Almost surely, 2^20950000 is an apocalyptic number.

20950000 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 20950000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25428060).

20950000 is an abundant number, since it is smaller than the sum of its proper divisors (29906120).

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

20950000 is an frugal number, since it uses more digits than its factorization.

20950000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 20950000 is about 4577.1169965383. The cubic root of 20950000 is about 275.6732813921.

Adding to 20950000 its reverse (5902), we get a palindrome (20955902).

The spelling of 20950000 in words is "twenty million, nine hundred fifty thousand".