20078641 has 4 divisors (see below), whose sum is σ = 21903984. Its totient is φ = 18253300.

The previous prime is 20078633. The next prime is 20078647. The reversal of 20078641 is 14687002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20078641 - 2³ = 20078633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20078647) 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, 912655 + ... + 912676.

It is an arithmetic number, because the mean of its divisors is an integer number (5475996).

Almost surely, 2^20078641 is an apocalyptic number.

It is an amenable number.

20078641 is a deficient number, since it is larger than the sum of its proper divisors (1825343).

20078641 is a wasteful number, since it uses less digits than its factorization.

20078641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825342.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20078641 is about 4480.9196600698. The cubic root of 20078641 is about 271.7970705611.

It can be divided in two parts, 2007 and 8641, that added together give a cube (10648 = 22³).

The spelling of 20078641 in words is "twenty million, seventy-eight thousand, six hundred forty-one".