20150440 has 32 divisors (see below), whose sum is σ = 48007080. Its totient is φ = 7585792.

The previous prime is 20150411. The next prime is 20150443. The reversal of 20150440 is 4405102.

It can be written as a sum of positive squares in 4 ways, for example, as 20124196 + 26244 = 4486^2 + 162^2 .

It is not an unprimeable number, because it can be changed into a prime (20150443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14137 + ... + 15496.

Almost surely, 2^20150440 is an apocalyptic number.

20150440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20150440 is an abundant number, since it is smaller than the sum of its proper divisors (27856640).

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

20150440 is a wasteful number, since it uses less digits than its factorization.

20150440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29661 (or 29657 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20150440 is about 4488.9241472763. The cubic root of 20150440 is about 272.1206572537.

Adding to 20150440 its reverse (4405102), we get a palindrome (24555542).

The spelling of 20150440 in words is "twenty million, one hundred fifty thousand, four hundred forty".