20919462784 has 32 divisors (see below), whose sum is σ = 45464176440. Its totient is φ = 9508846080.

The previous prime is 20919462779. The next prime is 20919462901. The reversal of 20919462784 is 48726491902.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×20919462784² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7427379 + ... + 7430194.

Almost surely, 2^20919462784 is an apocalyptic number.

It is an amenable number.

20919462784 is an abundant number, since it is smaller than the sum of its proper divisors (24544713656).

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

20919462784 is a wasteful number, since it uses less digits than its factorization.

20919462784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14857598 (or 14857586 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 20919462784 in words is "twenty billion, nine hundred nineteen million, four hundred sixty-two thousand, seven hundred eighty-four".