20857494 has 32 divisors (see below), whose sum is σ = 48787200. Its totient is φ = 5820192.

The previous prime is 20857483. The next prime is 20857511. The reversal of 20857494 is 49475802.

20857494 = 2282² + 2283² + ... + 2285².

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3969 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (1524600).

Almost surely, 2^20857494 is an apocalyptic number.

20857494 is an abundant number, since it is smaller than the sum of its proper divisors (27929706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20857494 is a wasteful number, since it uses less digits than its factorization.

20857494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11604.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20857494 is about 4567.0005474053. Note that the first 3 decimals coincide. The cubic root of 20857494 is about 275.2669320000.

The spelling of 20857494 in words is "twenty million, eight hundred fifty-seven thousand, four hundred ninety-four".