20244645 has 24 divisors (see below), whose sum is σ = 35237592. Its totient is φ = 10752000.

The previous prime is 20244641. The next prime is 20244647. The reversal of 20244645 is 54644202.

It can be written as a sum of positive squares in 4 ways, for example, as 9998244 + 10246401 = 3162^2 + 3201^2 .

It is not a de Polignac number, because 20244645 - 2² = 20244641 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20244641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11845 + ... + 13445.

It is an arithmetic number, because the mean of its divisors is an integer number (1468233).

Almost surely, 2^20244645 is an apocalyptic number.

It is an amenable number.

20244645 is a deficient number, since it is larger than the sum of its proper divisors (14992947).

20244645 is a wasteful number, since it uses less digits than its factorization.

20244645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 20244645 is about 4499.4049606587. The cubic root of 20244645 is about 272.5440604343.

Adding to 20244645 its reverse (54644202), we get a palindrome (74888847).

The spelling of 20244645 in words is "twenty million, two hundred forty-four thousand, six hundred forty-five".