20938656514 has 4 divisors (see below), whose sum is σ = 31407984774. Its totient is φ = 10469328256.

The previous prime is 20938656493. The next prime is 20938656521. The reversal of 20938656514 is 41565683902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41565683902 = 2 ⋅20782841951.

It can be written as a sum of positive squares in only one way, i.e., 15073700625 + 5864955889 = 122775^2 + 76583^2 .

It is a super-2 number, since 2×20938656514² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5234664127 + ... + 5234664130.

Almost surely, 2^20938656514 is an apocalyptic number.

20938656514 is a deficient number, since it is larger than the sum of its proper divisors (10469328260).

20938656514 is a wasteful number, since it uses less digits than its factorization.

20938656514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10469328259.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 20938656514 in words is "twenty billion, nine hundred thirty-eight million, six hundred fifty-six thousand, five hundred fourteen".