20888945 has 48 divisors (see below), whose sum is σ = 33291648. Its totient is φ = 12418560.

The previous prime is 20888941. The next prime is 20888953. The reversal of 20888945 is 54988802.

It is not a de Polignac number, because 20888945 - 2² = 20888941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20888896 and 20888905.

It is not an unprimeable number, because it can be changed into a prime (20888941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61817 + ... + 62153.

It is an arithmetic number, because the mean of its divisors is an integer number (693576).

Almost surely, 2^20888945 is an apocalyptic number.

It is an amenable number.

20888945 is a deficient number, since it is larger than the sum of its proper divisors (12402703).

20888945 is a wasteful number, since it uses less digits than its factorization.

20888945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 20888945 is about 4570.4425387483. The cubic root of 20888945 is about 275.4052207835.

The spelling of 20888945 in words is "twenty million, eight hundred eighty-eight thousand, nine hundred forty-five".