20949228 has 36 divisors (see below), whose sum is σ = 55259568. Its totient is φ = 6679200.

The previous prime is 20949221. The next prime is 20949239. The reversal of 20949228 is 82294902.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20949192 and 20949201.

It is not an unprimeable number, because it can be changed into a prime (20949221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11823 + ... + 13478.

It is an arithmetic number, because the mean of its divisors is an integer number (1534988).

Almost surely, 2^20949228 is an apocalyptic number.

It is an amenable number.

20949228 is an abundant number, since it is smaller than the sum of its proper divisors (34310340).

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

20949228 is a wasteful number, since it uses less digits than its factorization.

20949228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25334 (or 25329 counting only the distinct ones).

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

The square root of 20949228 is about 4577.0326632000. The cubic root of 20949228 is about 275.6698951966.

The spelling of 20949228 in words is "twenty million, nine hundred forty-nine thousand, two hundred twenty-eight".