20949494 has 4 divisors (see below), whose sum is σ = 31424244. Its totient is φ = 10474746.

The previous prime is 20949421. The next prime is 20949499. The reversal of 20949494 is 49494902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49494902 = 2 ⋅24747451.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5237372 + ... + 5237375.

It is an arithmetic number, because the mean of its divisors is an integer number (7856061).

Almost surely, 2^20949494 is an apocalyptic number.

20949494 is a deficient number, since it is larger than the sum of its proper divisors (10474750).

20949494 is a wasteful number, since it uses less digits than its factorization.

20949494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10474749.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20949494 is about 4577.0617212356. The cubic root of 20949494 is about 275.6710619521.

The spelling of 20949494 in words is "twenty million, nine hundred forty-nine thousand, four hundred ninety-four".