20546430640 has 20 divisors (see below), whose sum is σ = 47770451424. Its totient is φ = 8218572224.

The previous prime is 20546430629. The next prime is 20546430643. The reversal of 20546430640 is 4603464502.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 20546430596 and 20546430605.

It is not an unprimeable number, because it can be changed into a prime (20546430643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128415112 + ... + 128415271.

Almost surely, 2^20546430640 is an apocalyptic number.

20546430640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20546430640 is an abundant number, since it is smaller than the sum of its proper divisors (27224020784).

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

20546430640 is a wasteful number, since it uses less digits than its factorization.

20546430640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256830396 (or 256830390 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 20546430640 in words is "twenty billion, five hundred forty-six million, four hundred thirty thousand, six hundred forty".