20505194 has 8 divisors (see below), whose sum is σ = 30881088. Its totient is φ = 10211500.

The previous prime is 20505193. The next prime is 20505197. The reversal of 20505194 is 49150502.

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 (20505193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19922 + ... + 20925.

It is an arithmetic number, because the mean of its divisors is an integer number (3860136).

Almost surely, 2^20505194 is an apocalyptic number.

20505194 is a deficient number, since it is larger than the sum of its proper divisors (10375894).

20505194 is a wasteful number, since it uses less digits than its factorization.

20505194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41100.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20505194 is about 4528.2661140883. The cubic root of 20505194 is about 273.7082959482.

Adding to 20505194 its reverse (49150502), we get a palindrome (69655696).

The spelling of 20505194 in words is "twenty million, five hundred five thousand, one hundred ninety-four".