20720194 has 16 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 9008560.

The previous prime is 20720153. The next prime is 20720209. The reversal of 20720194 is 49102702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19969 + ... + 20980.

It is an arithmetic number, because the mean of its divisors is an integer number (2211300).

Almost surely, 2^20720194 is an apocalyptic number.

20720194 is a deficient number, since it is larger than the sum of its proper divisors (14660606).

20720194 is a wasteful number, since it uses less digits than its factorization.

20720194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40985.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20720194 is about 4551.9439803231. The cubic root of 20720194 is about 274.6615958653.

Adding to 20720194 its reverse (49102702), we get a palindrome (69822896).

The spelling of 20720194 in words is "twenty million, seven hundred twenty thousand, one hundred ninety-four".