20996922870 has 1152 divisors, whose sum is σ = 81313569792. Its totient is φ = 3832012800.

The previous prime is 20996922851. The next prime is 20996922871. The reversal of 20996922870 is 7822969902.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20996922871) by changing a digit.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 512120050 + ... + 512120090.

It is an arithmetic number, because the mean of its divisors is an integer number (70584696).

Almost surely, 2^20996922870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20996922870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40656784896).

20996922870 is an abundant number, since it is smaller than the sum of its proper divisors (60316646922).

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

20996922870 is a wasteful number, since it uses less digits than its factorization.

20996922870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 20996922870 in words is "twenty billion, nine hundred ninety-six million, nine hundred twenty-two thousand, eight hundred seventy".