20834357 has 4 divisors (see below), whose sum is σ = 20849856. Its totient is φ = 20818860.

The previous prime is 20834327. The next prime is 20834399. The reversal of 20834357 is 75343802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75343802 = 2 ⋅37671901.

It is a cyclic number.

It is not a de Polignac number, because 20834357 - 2¹⁸ = 20572213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20834327) 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, 5519 + ... + 8492.

It is an arithmetic number, because the mean of its divisors is an integer number (5212464).

Almost surely, 2^20834357 is an apocalyptic number.

It is an amenable number.

20834357 is a deficient number, since it is larger than the sum of its proper divisors (15499).

20834357 is a wasteful number, since it uses less digits than its factorization.

20834357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15498.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20834357 is about 4564.4667815639. The cubic root of 20834357 is about 275.1651107646.

The spelling of 20834357 in words is "twenty million, eight hundred thirty-four thousand, three hundred fifty-seven".