20700432838 has 16 divisors (see below), whose sum is σ = 32577736320. Its totient is φ = 9852134400.

The previous prime is 20700432821. The next prime is 20700432853. The reversal of 20700432838 is 83823400702.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20700432797 and 20700432806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732923 + ... + 2740486.

It is an arithmetic number, because the mean of its divisors is an integer number (2036108520).

Almost surely, 2^20700432838 is an apocalyptic number.

20700432838 is a deficient number, since it is larger than the sum of its proper divisors (11877303482).

20700432838 is a wasteful number, since it uses less digits than its factorization.

20700432838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5473503.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 20700432838 in words is "twenty billion, seven hundred million, four hundred thirty-two thousand, eight hundred thirty-eight".