20640011400 has 144 divisors (see below), whose sum is σ = 72329924160. Its totient is φ = 5264688000.

The previous prime is 20640011387. The next prime is 20640011401. The reversal of 20640011400 is 411004602.

20640011400 is a `hidden beast` number, since 20 + 640 + 0 + 1 + 1 + 4 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20640011401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 207876 + ... + 290675.

It is an arithmetic number, because the mean of its divisors is an integer number (502291140).

Almost surely, 2^20640011400 is an apocalyptic number.

20640011400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640011400 is an abundant number, since it is smaller than the sum of its proper divisors (51689912760).

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

20640011400 is a wasteful number, since it uses less digits than its factorization.

20640011400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498596 (or 498584 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The spelling of 20640011400 in words is "twenty billion, six hundred forty million, eleven thousand, four hundred".