20440370 has 8 divisors (see below), whose sum is σ = 36792684. Its totient is φ = 8176144.

The previous prime is 20440369. The next prime is 20440379. The reversal of 20440370 is 7304402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18139081 + 2301289 = 4259^2 + 1517^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20440379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022009 + ... + 1022028.

Almost surely, 2^20440370 is an apocalyptic number.

20440370 is a deficient number, since it is larger than the sum of its proper divisors (16352314).

20440370 is a wasteful number, since it uses less digits than its factorization.

20440370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044044.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20440370 is about 4521.1027415886. The cubic root of 20440370 is about 273.4195626546.

Adding to 20440370 its reverse (7304402), we get a palindrome (27744772).

The spelling of 20440370 in words is "twenty million, four hundred forty thousand, three hundred seventy".