20151501944 has 16 divisors (see below), whose sum is σ = 43181790000. Its totient is φ = 8636357952.

The previous prime is 20151501899. The next prime is 20151501947. The reversal of 20151501944 is 44910515102.

It is a self number, because there is not a number n which added to its sum of digits gives 20151501944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151501947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179924069 + ... + 179924180.

It is an arithmetic number, because the mean of its divisors is an integer number (2698861875).

Almost surely, 2^20151501944 is an apocalyptic number.

It is an amenable number.

20151501944 is an abundant number, since it is smaller than the sum of its proper divisors (23030288056).

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

20151501944 is a wasteful number, since it uses less digits than its factorization.

20151501944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359848262 (or 359848258 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 20151501944 in words is "twenty billion, one hundred fifty-one million, five hundred one thousand, nine hundred forty-four".