20194251 has 16 divisors (see below), whose sum is σ = 33570048. Its totient is φ = 10490400.

The previous prime is 20194241. The next prime is 20194259. The reversal of 20194251 is 15249102.

It is not a de Polignac number, because 20194251 - 2⁷ = 20194123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20194259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43480 + ... + 43941.

It is an arithmetic number, because the mean of its divisors is an integer number (2098128).

Almost surely, 2^20194251 is an apocalyptic number.

20194251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20194251 is a deficient number, since it is larger than the sum of its proper divisors (13375797).

20194251 is a wasteful number, since it uses less digits than its factorization.

20194251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87442.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20194251 is about 4493.8013974808. The cubic root of 20194251 is about 272.3177290194.

The spelling of 20194251 in words is "twenty million, one hundred ninety-four thousand, two hundred fifty-one".