20438696918 has 8 divisors (see below), whose sum is σ = 31486641312. Its totient is φ = 9943149816.

The previous prime is 20438696903. The next prime is 20438696939. The reversal of 20438696918 is 81969683402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138099230 + ... + 138099377.

It is an arithmetic number, because the mean of its divisors is an integer number (3935830164).

Almost surely, 2^20438696918 is an apocalyptic number.

20438696918 is a deficient number, since it is larger than the sum of its proper divisors (11047944394).

20438696918 is a wasteful number, since it uses less digits than its factorization.

20438696918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276198646.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 20438696918 in words is "twenty billion, four hundred thirty-eight million, six hundred ninety-six thousand, nine hundred eighteen".