20493949 has 4 divisors (see below), whose sum is σ = 23421664. Its totient is φ = 17566236.

The previous prime is 20493919. The next prime is 20493953. The reversal of 20493949 is 94939402.

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 a cyclic number.

It is not a de Polignac number, because 20493949 - 2¹¹ = 20491901 is a prime.

It is a super-2 number, since 2×20493949² = 840003891229202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20493919) 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, 1463847 + ... + 1463860.

It is an arithmetic number, because the mean of its divisors is an integer number (5855416).

Almost surely, 2^20493949 is an apocalyptic number.

It is an amenable number.

20493949 is a deficient number, since it is larger than the sum of its proper divisors (2927715).

20493949 is an equidigital number, since it uses as much as digits as its factorization.

20493949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927714.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20493949 is about 4527.0242985873. The cubic root of 20493949 is about 273.6582531381.

The spelling of 20493949 in words is "twenty million, four hundred ninety-three thousand, nine hundred forty-nine".