20949053664 has 96 divisors (see below), whose sum is σ = 68560563456. Its totient is φ = 5441310720.

The previous prime is 20949053663. The next prime is 20949053711. The reversal of 20949053664 is 46635094902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949053663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1409617 + ... + 1424400.

It is an arithmetic number, because the mean of its divisors is an integer number (714172536).

Almost surely, 2^20949053664 is an apocalyptic number.

20949053664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20949053664 is an abundant number, since it is smaller than the sum of its proper divisors (47611509792).

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

20949053664 is a wasteful number, since it uses less digits than its factorization.

20949053664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834048 (or 2834040 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 20949053664 in words is "twenty billion, nine hundred forty-nine million, fifty-three thousand, six hundred sixty-four".