20142949 has 4 divisors (see below), whose sum is σ = 20151936. Its totient is φ = 20133964.

The previous prime is 20142929. The next prime is 20142959. The reversal of 20142949 is 94924102.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20142949 - 2⁷ = 20142821 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20142949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20142919) 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, 1932 + ... + 6634.

It is an arithmetic number, because the mean of its divisors is an integer number (5037984).

Almost surely, 2^20142949 is an apocalyptic number.

It is an amenable number.

20142949 is a deficient number, since it is larger than the sum of its proper divisors (8987).

20142949 is an equidigital number, since it uses as much as digits as its factorization.

20142949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8986.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20142949 is about 4488.0896827047. The cubic root of 20142949 is about 272.0869324567.

The spelling of 20142949 in words is "twenty million, one hundred forty-two thousand, nine hundred forty-nine".