20942117 has 4 divisors (see below), whose sum is σ = 23933856. Its totient is φ = 17950380.

The previous prime is 20942101. The next prime is 20942149. The reversal of 20942117 is 71124902.

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.

It is not a de Polignac number, because 20942117 - 2⁴ = 20942101 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 (20942417) 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, 1495859 + ... + 1495872.

It is an arithmetic number, because the mean of its divisors is an integer number (5983464).

Almost surely, 2^20942117 is an apocalyptic number.

It is an amenable number.

20942117 is a deficient number, since it is larger than the sum of its proper divisors (2991739).

20942117 is an equidigital number, since it uses as much as digits as its factorization.

20942117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991738.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20942117 is about 4576.2557839352. The cubic root of 20942117 is about 275.6387005631.

The spelling of 20942117 in words is "twenty million, nine hundred forty-two thousand, one hundred seventeen".