20570440 has 32 divisors (see below), whose sum is σ = 50492160. Its totient is φ = 7480000.

The previous prime is 20570423. The next prime is 20570449. The reversal of 20570440 is 4407502.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20570449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22936 + ... + 23815.

It is an arithmetic number, because the mean of its divisors is an integer number (1577880).

Almost surely, 2^20570440 is an apocalyptic number.

20570440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20570440 is an abundant number, since it is smaller than the sum of its proper divisors (29921720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20570440 is a wasteful number, since it uses less digits than its factorization.

20570440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46773 (or 46769 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20570440 is about 4535.4646950450. The cubic root of 20570440 is about 273.9982950504.

Adding to 20570440 its reverse (4407502), we get a palindrome (24977942).

The spelling of 20570440 in words is "twenty million, five hundred seventy thousand, four hundred forty".