20949088644 has 405 divisors, whose sum is σ = 65467241301. Its totient is φ = 5835836160.

The previous prime is 20949088613. The next prime is 20949088669. The reversal of 20949088644 is 44688094902.

The square root of 20949088644 is 144738.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16309844100 + 4639244544 = 127710^2 + 68112^2 .

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 134 ways as a sum of consecutive naturals, for example, 487188087 + ... + 487188129.

Almost surely, 2^20949088644 is an apocalyptic number.

20949088644 is the 144738-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20949088644

20949088644 is an abundant number, since it is smaller than the sum of its proper divisors (44518152657).

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

20949088644 is a wasteful number, since it uses less digits than its factorization.

20949088644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 20949088644 in words is "twenty billion, nine hundred forty-nine million, eighty-eight thousand, six hundred forty-four".