20751505016 has 64 divisors (see below), whose sum is σ = 43757798400. Its totient is φ = 9145440000.

The previous prime is 20751505009. The next prime is 20751505051. The reversal of 20751505016 is 61050515702.

It is a congruent number.

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, 351641 + ... + 406391.

It is an arithmetic number, because the mean of its divisors is an integer number (683715600).

Almost surely, 2^20751505016 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 20751505016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21878899200).

20751505016 is an abundant number, since it is smaller than the sum of its proper divisors (23006293384).

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

20751505016 is a wasteful number, since it uses less digits than its factorization.

20751505016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54900 (or 54896 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 32.

The spelling of 20751505016 in words is "twenty billion, seven hundred fifty-one million, five hundred five thousand, sixteen".