20533123240 has 64 divisors (see below), whose sum is σ = 52814280960. Its totient is φ = 7037952000.

The previous prime is 20533123231. The next prime is 20533123271. The reversal of 20533123240 is 4232133502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275240 + ... + 1291240.

It is an arithmetic number, because the mean of its divisors is an integer number (825223140).

Almost surely, 2^20533123240 is an apocalyptic number.

20533123240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533123240 is an abundant number, since it is smaller than the sum of its proper divisors (32281157720).

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

20533123240 is a wasteful number, since it uses less digits than its factorization.

20533123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20602 (or 20598 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 20533123240 its reverse (4232133502), we get a palindrome (24765256742).

The spelling of 20533123240 in words is "twenty billion, five hundred thirty-three million, one hundred twenty-three thousand, two hundred forty".