20406149784 has 96 divisors (see below), whose sum is σ = 58556628000. Its totient is φ = 6397664256.

The previous prime is 20406149741. The next prime is 20406149809. The reversal of 20406149784 is 48794160402.

20406149784 is a `hidden beast` number, since 20 + 4 + 0 + 61 + 497 + 84 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2185077 + ... + 2194395.

It is an arithmetic number, because the mean of its divisors is an integer number (609964875).

Almost surely, 2^20406149784 is an apocalyptic number.

20406149784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20406149784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29278314000).

20406149784 is an abundant number, since it is smaller than the sum of its proper divisors (38150478216).

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

20406149784 is a wasteful number, since it uses less digits than its factorization.

20406149784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137 (or 11130 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 20406149784 in words is "twenty billion, four hundred six million, one hundred forty-nine thousand, seven hundred eighty-four".