20005440238 has 32 divisors (see below), whose sum is σ = 35238104064. Its totient is φ = 8338207392.

The previous prime is 20005440197. The next prime is 20005440239. The reversal of 20005440238 is 83204450002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005440239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309681 + ... + 1324867.

It is an arithmetic number, because the mean of its divisors is an integer number (1101190752).

Almost surely, 2^20005440238 is an apocalyptic number.

20005440238 is a deficient number, since it is larger than the sum of its proper divisors (15232663826).

20005440238 is a wasteful number, since it uses less digits than its factorization.

20005440238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17776.

The product of its (nonzero) digits is 7680, while the sum is 28.

The spelling of 20005440238 in words is "twenty billion, five million, four hundred forty thousand, two hundred thirty-eight".