20523131502 has 16 divisors (see below), whose sum is σ = 41216582352. Its totient is φ = 6812657280.

The previous prime is 20523131491. The next prime is 20523131509. The reversal of 20523131502 is 20513132502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523131509) 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, 7095073 + ... + 7097964.

It is an arithmetic number, because the mean of its divisors is an integer number (2576036397).

Almost surely, 2^20523131502 is an apocalyptic number.

20523131502 is an abundant number, since it is smaller than the sum of its proper divisors (20693450850).

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

20523131502 is a wasteful number, since it uses less digits than its factorization.

20523131502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14193283.

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 20523131502 in words is "twenty billion, five hundred twenty-three million, one hundred thirty-one thousand, five hundred two".