20859994 has 8 divisors (see below), whose sum is σ = 31471380. Its totient is φ = 10369536.

The previous prime is 20859983. The next prime is 20859997. The reversal of 20859994 is 49995802.

It can be written as a sum of positive squares in 2 ways, for example, as 20584369 + 275625 = 4537^2 + 525^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20859997) 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, 29799 + ... + 30490.

Almost surely, 2^20859994 is an apocalyptic number.

20859994 is a deficient number, since it is larger than the sum of its proper divisors (10611386).

20859994 is a wasteful number, since it uses less digits than its factorization.

20859994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60464.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 20859994 is about 4567.2742418208. The cubic root of 20859994 is about 275.2779294835.

The spelling of 20859994 in words is "twenty million, eight hundred fifty-nine thousand, nine hundred ninety-four".