20445988 has 48 divisors (see below), whose sum is σ = 39481344. Its totient is φ = 9234720.

The previous prime is 20445979. The next prime is 20445989. The reversal of 20445988 is 88954402.

It is a super-2 number, since 2×20445988² = 836076850592288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20445988.

It is not an unprimeable number, because it can be changed into a prime (20445989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191031 + ... + 191137.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 2^20445988 is an apocalyptic number.

It is an amenable number.

20445988 is a deficient number, since it is larger than the sum of its proper divisors (19035356).

20445988 is a wasteful number, since it uses less digits than its factorization.

20445988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20445988 is about 4521.7240074998. The cubic root of 20445988 is about 273.4446099898. Note that the first 3 decimals are identical.

The spelling of 20445988 in words is "twenty million, four hundred forty-five thousand, nine hundred eighty-eight".