20145133240 has 32 divisors (see below), whose sum is σ = 45439619760. Its totient is φ = 8037952000.

The previous prime is 20145133237. The next prime is 20145133247. The reversal of 20145133240 is 4233154102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145133247) 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, 611926 + ... + 644005.

Almost surely, 2^20145133240 is an apocalyptic number.

20145133240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145133240 is an abundant number, since it is smaller than the sum of its proper divisors (25294486520).

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

20145133240 is a wasteful number, since it uses less digits than its factorization.

20145133240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256343 (or 1256339 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 20145133240 its reverse (4233154102), we get a palindrome (24378287342).

The spelling of 20145133240 in words is "twenty billion, one hundred forty-five million, one hundred thirty-three thousand, two hundred forty".