20740051 has 16 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 18944640.

The previous prime is 20740021. The next prime is 20740063. The reversal of 20740051 is 15004702.

It is a cyclic number.

It is not a de Polignac number, because 20740051 - 2⁷ = 20739923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20740021) 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, 149140 + ... + 149278.

It is an arithmetic number, because the mean of its divisors is an integer number (1413720).

Almost surely, 2^20740051 is an apocalyptic number.

20740051 is a deficient number, since it is larger than the sum of its proper divisors (1879469).

20740051 is a wasteful number, since it uses less digits than its factorization.

20740051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20740051 is about 4554.1246140175. The cubic root of 20740051 is about 274.7493076243.

Adding to 20740051 its reverse (15004702), we get a palindrome (35744753).

The spelling of 20740051 in words is "twenty million, seven hundred forty thousand, fifty-one".