20911994 has 8 divisors (see below), whose sum is σ = 31594080. Its totient is φ = 10380636.

The previous prime is 20911963. The next prime is 20912029. The reversal of 20911994 is 49911902.

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

It is a super-2 number, since 2×20911994² = 874622986112072, which contains 22 as substring.

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, 37334 + ... + 37889.

It is an arithmetic number, because the mean of its divisors is an integer number (3949260).

Almost surely, 2^20911994 is an apocalyptic number.

20911994 is a deficient number, since it is larger than the sum of its proper divisors (10682086).

20911994 is a wasteful number, since it uses less digits than its factorization.

20911994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75364.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 20911994 is about 4572.9633718192. The cubic root of 20911994 is about 275.5064781970.

The spelling of 20911994 in words is "twenty million, nine hundred eleven thousand, nine hundred ninety-four".