20944955808 has 192 divisors, whose sum is σ = 73923736320. Its totient is φ = 5632229376.

The previous prime is 20944955771. The next prime is 20944955831. The reversal of 20944955808 is 80855944902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 960 + ... + 204672.

It is an arithmetic number, because the mean of its divisors is an integer number (385019460).

Almost surely, 2^20944955808 is an apocalyptic number.

20944955808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20944955808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36961868160).

20944955808 is an abundant number, since it is smaller than the sum of its proper divisors (52978780512).

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

20944955808 is a wasteful number, since it uses less digits than its factorization.

20944955808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203756 (or 203742 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 20944955808 in words is "twenty billion, nine hundred forty-four million, nine hundred fifty-five thousand, eight hundred eight".