20954731776 has 144 divisors (see below), whose sum is σ = 61322354688. Its totient is φ = 6299596800.

The previous prime is 20954731771. The next prime is 20954731807. The reversal of 20954731776 is 67713745902.

It is a happy number.

It is a super-2 number, since 2×20954731776² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20954731771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1063131 + ... + 1082661.

Almost surely, 2^20954731776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20954731776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30661177344).

20954731776 is an abundant number, since it is smaller than the sum of its proper divisors (40367622912).

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

20954731776 is a wasteful number, since it uses less digits than its factorization.

20954731776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19688 (or 19674 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 51.

The spelling of 20954731776 in words is "twenty billion, nine hundred fifty-four million, seven hundred thirty-one thousand, seven hundred seventy-six".