20949948 has 48 divisors (see below), whose sum is σ = 56196000. Its totient is φ = 6741504.

The previous prime is 20949937. The next prime is 20949949. The reversal of 20949948 is 84994902.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949949) 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 in 15 ways as a sum of consecutive naturals, for example, 213 + ... + 6476.

It is an arithmetic number, because the mean of its divisors is an integer number (1170750).

Almost surely, 2^20949948 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20949948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28098000).

20949948 is an abundant number, since it is smaller than the sum of its proper divisors (35246052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20949948 is a wasteful number, since it uses less digits than its factorization.

20949948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731 (or 6723 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20949948 is about 4577.1113161032. Note that the first 3 decimals coincide. The cubic root of 20949948 is about 275.6730533090.

The spelling of 20949948 in words is "twenty million, nine hundred forty-nine thousand, nine hundred forty-eight".