20445919988 has 48 divisors (see below), whose sum is σ = 40691763840. Its totient is φ = 8911036800.

The previous prime is 20445919987. The next prime is 20445919993. The reversal of 20445919988 is 88991954402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445919987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273998 + ... + 340538.

It is an arithmetic number, because the mean of its divisors is an integer number (847745080).

Almost surely, 2^20445919988 is an apocalyptic number.

It is an amenable number.

20445919988 is a deficient number, since it is larger than the sum of its proper divisors (20245843852).

20445919988 is a wasteful number, since it uses less digits than its factorization.

20445919988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66888 (or 66886 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 59.

The spelling of 20445919988 in words is "twenty billion, four hundred forty-five million, nine hundred nineteen thousand, nine hundred eighty-eight".