20540738 has 8 divisors (see below), whose sum is σ = 30830988. Its totient is φ = 10263744.

The previous prime is 20540731. The next prime is 20540747. The reversal of 20540738 is 83704502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19651489 + 889249 = 4433^2 + 943^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20540738.

It is not an unprimeable number, because it can be changed into a prime (20540731) 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, 2870 + ... + 7022.

Almost surely, 2^20540738 is an apocalyptic number.

20540738 is a deficient number, since it is larger than the sum of its proper divisors (10290250).

20540738 is a wasteful number, since it uses less digits than its factorization.

20540738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20540738 is about 4532.1890957902. The cubic root of 20540738 is about 273.8663546299.

The spelling of 20540738 in words is "twenty million, five hundred forty thousand, seven hundred thirty-eight".