20465234784 has 72 divisors (see below), whose sum is σ = 60075392832. Its totient is φ = 6601685760.

The previous prime is 20465234767. The next prime is 20465234807. The reversal of 20465234784 is 48743256402.

It is a happy number.

20465234784 is a `hidden beast` number, since 2 + 0 + 4 + 6 + 523 + 47 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1137199 + ... + 1155054.

It is an arithmetic number, because the mean of its divisors is an integer number (834380456).

Almost surely, 2^20465234784 is an apocalyptic number.

20465234784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20465234784 is an abundant number, since it is smaller than the sum of its proper divisors (39610158048).

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

20465234784 is a wasteful number, since it uses less digits than its factorization.

20465234784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292300 (or 2292289 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 45.

The spelling of 20465234784 in words is "twenty billion, four hundred sixty-five million, two hundred thirty-four thousand, seven hundred eighty-four".