20192921340938 has 4 divisors (see below), whose sum is σ = 30289382011410. Its totient is φ = 10096460670468.

The previous prime is 20192921340937. The next prime is 20192921341007. The reversal of 20192921340938 is 83904312929102.

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., 19866426809329 + 326494531609 = 4457177^2 + 571397^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20192921340938.

It is not an unprimeable number, because it can be changed into a prime (20192921340937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5048230335233 + ... + 5048230335236.

Almost surely, 2^{20192921340938} is an apocalyptic number.

20192921340938 is a deficient number, since it is larger than the sum of its proper divisors (10096460670472).

20192921340938 is a wasteful number, since it uses less digits than its factorization.

20192921340938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096460670471.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 20192921340938 in words is "twenty trillion, one hundred ninety-two billion, nine hundred twenty-one million, three hundred forty thousand, nine hundred thirty-eight".