20773737440 has 48 divisors (see below), whose sum is σ = 49436240112. Its totient is φ = 8248833024.

The previous prime is 20773737433. The next prime is 20773737451. The reversal of 20773737440 is 4473737702.

It is a junction number, because it is equal to n+sod(n) for n = 20773737391 and 20773737400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451934 + ... + 495773.

It is an arithmetic number, because the mean of its divisors is an integer number (1029921669).

Almost surely, 2^20773737440 is an apocalyptic number.

20773737440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20773737440 is an abundant number, since it is smaller than the sum of its proper divisors (28662502672).

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

20773737440 is a wasteful number, since it uses less digits than its factorization.

20773737440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947859 (or 947851 counting only the distinct ones).

The product of its (nonzero) digits is 691488, while the sum is 44.

The spelling of 20773737440 in words is "twenty billion, seven hundred seventy-three million, seven hundred thirty-seven thousand, four hundred forty".