20842331 has 4 divisors (see below), whose sum is σ = 20957664. Its totient is φ = 20727000.

The previous prime is 20842319. The next prime is 20842337. The reversal of 20842331 is 13324802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13324802 = 2 ⋅6662401.

It is a cyclic number.

It is not a de Polignac number, because 20842331 - 2¹⁰ = 20841307 is a prime.

It is a super-2 number, since 2×20842331² = 868805523027122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20842297 and 20842306.

It is not an unprimeable number, because it can be changed into a prime (20842337) 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, 57395 + ... + 57756.

It is an arithmetic number, because the mean of its divisors is an integer number (5239416).

Almost surely, 2^20842331 is an apocalyptic number.

20842331 is a deficient number, since it is larger than the sum of its proper divisors (115333).

20842331 is a wasteful number, since it uses less digits than its factorization.

20842331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115332.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20842331 is about 4565.3401844769. The cubic root of 20842331 is about 275.2002112275.

The spelling of 20842331 in words is "twenty million, eight hundred forty-two thousand, three hundred thirty-one".