20151938 has 8 divisors (see below), whose sum is σ = 30354060. Its totient is φ = 10033920.

The previous prime is 20151931. The next prime is 20151947. The reversal of 20151938 is 83915102.

It can be written as a sum of positive squares in 2 ways, for example, as 20133169 + 18769 = 4487^2 + 137^2 .

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

It is a super-2 number, since 2×20151938² = 812201210311688, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20151938.

It is not an unprimeable number, because it can be changed into a prime (20151931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20423 + ... + 21386.

Almost surely, 2^20151938 is an apocalyptic number.

20151938 is a deficient number, since it is larger than the sum of its proper divisors (10202122).

20151938 is a wasteful number, since it uses less digits than its factorization.

20151938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42052.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 20151938 is about 4489.0909993004. The cubic root of 20151938 is about 272.1274003098.

The spelling of 20151938 in words is "twenty million, one hundred fifty-one thousand, nine hundred thirty-eight".