20445970 has 16 divisors (see below), whose sum is σ = 37217880. Its totient is φ = 8086144.

The previous prime is 20445961. The next prime is 20445973. The reversal of 20445970 is 7954402.

It can be written as a sum of positive squares in 4 ways, for example, as 14040009 + 6405961 = 3747^2 + 2531^2 .

It is not an unprimeable number, because it can be changed into a prime (20445973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10597 + ... + 12376.

Almost surely, 2^20445970 is an apocalyptic number.

20445970 is a deficient number, since it is larger than the sum of its proper divisors (16771910).

20445970 is a wasteful number, since it uses less digits than its factorization.

20445970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23069.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20445970 is about 4521.7220171081. The cubic root of 20445970 is about 273.4445297458. Note that the first 3 decimals are identical.

The spelling of 20445970 in words is "twenty million, four hundred forty-five thousand, nine hundred seventy".