20904948 has 18 divisors (see below), whose sum is σ = 52843154. Its totient is φ = 6968304.

The previous prime is 20904941. The next prime is 20904971. The reversal of 20904948 is 84940902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 1764 = 4572^2 + 42^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 580693 = 20904948 / (2 + 0 + 9 + 0 + 4 + 9 + 4 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20904941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290311 + ... + 290382.

Almost surely, 2^20904948 is an apocalyptic number.

It is an amenable number.

20904948 is an abundant number, since it is smaller than the sum of its proper divisors (31938206).

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

20904948 is a wasteful number, since it uses less digits than its factorization.

20904948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580703 (or 580698 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20904948 is about 4572.1929093161. The cubic root of 20904948 is about 275.4755320534.

The spelling of 20904948 in words is "twenty million, nine hundred four thousand, nine hundred forty-eight".