20438612164 has 6 divisors (see below), whose sum is σ = 35767571294. Its totient is φ = 10219306080.

The previous prime is 20438612147. The next prime is 20438612221. The reversal of 20438612164 is 46121683402.

It can be written as a sum of positive squares in only one way, i.e., 16322106564 + 4116505600 = 127758^2 + 64160^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554826517 + ... + 2554826524.

Almost surely, 2^20438612164 is an apocalyptic number.

It is an amenable number.

20438612164 is a deficient number, since it is larger than the sum of its proper divisors (15328959130).

20438612164 is a wasteful number, since it uses less digits than its factorization.

20438612164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5109653045 (or 5109653043 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 20438612164 in words is "twenty billion, four hundred thirty-eight million, six hundred twelve thousand, one hundred sixty-four".