20438332144 has 40 divisors (see below), whose sum is σ = 41997378960. Its totient is φ = 9602270208.

The previous prime is 20438332097. The next prime is 20438332217. The reversal of 20438332144 is 44123383402.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 105447 + ... + 228025.

It is an arithmetic number, because the mean of its divisors is an integer number (1049934474).

Almost surely, 2^20438332144 is an apocalyptic number.

It is an amenable number.

20438332144 is an abundant number, since it is smaller than the sum of its proper divisors (21559046816).

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

20438332144 is a wasteful number, since it uses less digits than its factorization.

20438332144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123217 (or 123211 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 20438332144 in words is "twenty billion, four hundred thirty-eight million, three hundred thirty-two thousand, one hundred forty-four".