20869994 has 4 divisors (see below), whose sum is σ = 31304994. Its totient is φ = 10434996.

The previous prime is 20869987. The next prime is 20870023. The reversal of 20869994 is 49996802.

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., 18190225 + 2679769 = 4265^2 + 1637^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5217497 + ... + 5217500.

Almost surely, 2^20869994 is an apocalyptic number.

20869994 is a deficient number, since it is larger than the sum of its proper divisors (10435000).

20869994 is a wasteful number, since it uses less digits than its factorization.

20869994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10434999.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 20869994 is about 4568.3688555107. The cubic root of 20869994 is about 275.3219106328.

The spelling of 20869994 in words is "twenty million, eight hundred sixty-nine thousand, nine hundred ninety-four".