20899994 has 4 divisors (see below), whose sum is σ = 31349994. Its totient is φ = 10449996.

The previous prime is 20899993. The next prime is 20900051. The reversal of 20899994 is 49999802.

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., 17749369 + 3150625 = 4213^2 + 1775^2 .

It is not an unprimeable number, because it can be changed into a prime (20899993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5224997 + ... + 5225000.

Almost surely, 2^20899994 is an apocalyptic number.

20899994 is a deficient number, since it is larger than the sum of its proper divisors (10450000).

20899994 is a wasteful number, since it uses less digits than its factorization.

20899994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449999.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 20899994 is about 4571.6511240470. The cubic root of 20899994 is about 275.4537698434.

The spelling of 20899994 in words is "twenty million, eight hundred ninety-nine thousand, nine hundred ninety-four".