20078351 has 4 divisors (see below), whose sum is σ = 20110032. Its totient is φ = 20046672.

The previous prime is 20078347. The next prime is 20078371. The reversal of 20078351 is 15387002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20078351 - 2² = 20078347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20078351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078341) 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, 14870 + ... + 16163.

It is an arithmetic number, because the mean of its divisors is an integer number (5027508).

Almost surely, 2^20078351 is an apocalyptic number.

20078351 is a deficient number, since it is larger than the sum of its proper divisors (31681).

20078351 is an equidigital number, since it uses as much as digits as its factorization.

20078351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31680.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20078351 is about 4480.8873005243. The cubic root of 20078351 is about 271.7957620142.

The spelling of 20078351 in words is "twenty million, seventy-eight thousand, three hundred fifty-one".