20001767138 has 4 divisors (see below), whose sum is σ = 30002650710. Its totient is φ = 10000883568.

The previous prime is 20001767131. The next prime is 20001767147. The reversal of 20001767138 is 83176710002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19899898489 + 101868649 = 141067^2 + 10093^2 .

It is a super-2 number, since 2×20001767138² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20001767098 and 20001767107.

It is not an unprimeable number, because it can be changed into a prime (20001767131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000441783 + ... + 5000441786.

Almost surely, 2^20001767138 is an apocalyptic number.

20001767138 is a deficient number, since it is larger than the sum of its proper divisors (10000883572).

20001767138 is a wasteful number, since it uses less digits than its factorization.

20001767138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000883571.

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 20001767138 in words is "twenty billion, one million, seven hundred sixty-seven thousand, one hundred thirty-eight".