20146939 has 4 divisors (see below), whose sum is σ = 20156256. Its totient is φ = 20137624.

The previous prime is 20146927. The next prime is 20146961. The reversal of 20146939 is 93964102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20146939 - 2¹⁹ = 19622651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20146969) 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, 462 + ... + 6364.

It is an arithmetic number, because the mean of its divisors is an integer number (5039064).

Almost surely, 2^20146939 is an apocalyptic number.

20146939 is a deficient number, since it is larger than the sum of its proper divisors (9317).

20146939 is an equidigital number, since it uses as much as digits as its factorization.

20146939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9316.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20146939 is about 4488.5341705283. The cubic root of 20146939 is about 272.1048966450.

The spelling of 20146939 in words is "twenty million, one hundred forty-six thousand, nine hundred thirty-nine".