20531145234 has 32 divisors (see below), whose sum is σ = 41618339136. Its totient is φ = 6751572480.

The previous prime is 20531145197. The next prime is 20531145241. The reversal of 20531145234 is 43254113502.

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, 88374 + ... + 221070.

It is an arithmetic number, because the mean of its divisors is an integer number (1300573098).

Almost surely, 2^20531145234 is an apocalyptic number.

20531145234 is an abundant number, since it is smaller than the sum of its proper divisors (21087193902).

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

20531145234 is a wasteful number, since it uses less digits than its factorization.

20531145234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133050.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 20531145234 its reverse (43254113502), we get a palindrome (63785258736).

The spelling of 20531145234 in words is "twenty billion, five hundred thirty-one million, one hundred forty-five thousand, two hundred thirty-four".