20121938 has 8 divisors (see below), whose sum is σ = 30203388. Its totient is φ = 10054144.

The previous prime is 20121923. The next prime is 20121947. The reversal of 20121938 is 83912102.

It can be written as a sum of positive squares in 2 ways, for example, as 20097289 + 24649 = 4483^2 + 157^2 .

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

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, 1970 + ... + 6642.

Almost surely, 2^20121938 is an apocalyptic number.

20121938 is a deficient number, since it is larger than the sum of its proper divisors (10081450).

20121938 is a wasteful number, since it uses less digits than its factorization.

20121938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6828.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20121938 is about 4485.7483210720. The cubic root of 20121938 is about 271.9922954133.

The spelling of 20121938 in words is "twenty million, one hundred twenty-one thousand, nine hundred thirty-eight".