20640150 has 48 divisors (see below), whose sum is σ = 56878800. Its totient is φ = 5503680.

The previous prime is 20640149. The next prime is 20640157. The reversal of 20640150 is 5104602.

It is a happy number.

20640150 is a `hidden beast` number, since 20 + 640 + 1 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6295 + ... + 8994.

It is an arithmetic number, because the mean of its divisors is an integer number (1184975).

Almost surely, 2^20640150 is an apocalyptic number.

20640150 is an abundant number, since it is smaller than the sum of its proper divisors (36238650).

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

20640150 is a wasteful number, since it uses less digits than its factorization.

20640150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15310 (or 15299 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20640150 is about 4543.1431850647. The cubic root of 20640150 is about 274.3074585161.

Adding to 20640150 its reverse (5104602), we get a palindrome (25744752).

The spelling of 20640150 in words is "twenty million, six hundred forty thousand, one hundred fifty".