20531500416 has 192 divisors, whose sum is σ = 67956014880. Its totient is φ = 5828419584.

The previous prime is 20531500411. The next prime is 20531500421. The reversal of 20531500416 is 61400513502.

It is an interprime number because it is at equal distance from previous prime (20531500411) and next prime (20531500421).

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 20531500416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531500411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1257940 + ... + 1274156.

Almost surely, 2^20531500416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531500416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33978007440).

20531500416 is an abundant number, since it is smaller than the sum of its proper divisors (47424514464).

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

20531500416 is a wasteful number, since it uses less digits than its factorization.

20531500416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16401 (or 16386 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 20531500416 in words is "twenty billion, five hundred thirty-one million, five hundred thousand, four hundred sixteen".