20551433250940 has 48 divisors (see below), whose sum is σ = 43205374485504. Its totient is φ = 8211552552000.

The previous prime is 20551433250911. The next prime is 20551433250941. The reversal of 20551433250940 is 4905233415502.

It is a super-2 number, since 2×20551433250940² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551433250941) 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, 491041015 + ... + 491082865.

It is an arithmetic number, because the mean of its divisors is an integer number (900111968448).

Almost surely, 2^{20551433250940} is an apocalyptic number.

20551433250940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20551433250940 is an abundant number, since it is smaller than the sum of its proper divisors (22653941234564).

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

20551433250940 is a wasteful number, since it uses less digits than its factorization.

20551433250940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68218 (or 68216 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 20551433250940 in words is "twenty trillion, five hundred fifty-one billion, four hundred thirty-three million, two hundred fifty thousand, nine hundred forty".