20937890 has 8 divisors (see below), whose sum is σ = 37688220. Its totient is φ = 8375152.

The previous prime is 20937881. The next prime is 20937901. The reversal of 20937890 is 9873902.

It can be written as a sum of positive squares in 2 ways, for example, as 20151121 + 786769 = 4489^2 + 887^2 .

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, 1046885 + ... + 1046904.

Almost surely, 2^20937890 is an apocalyptic number.

20937890 is a deficient number, since it is larger than the sum of its proper divisors (16750330).

20937890 is a wasteful number, since it uses less digits than its factorization.

20937890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093796.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20937890 is about 4575.7939201848. The cubic root of 20937890 is about 275.6201541544.

The spelling of 20937890 in words is "twenty million, nine hundred thirty-seven thousand, eight hundred ninety".