20078428 has 12 divisors (see below), whose sum is σ = 37204272. Its totient is φ = 9448640.

The previous prime is 20078419. The next prime is 20078441. The reversal of 20078428 is 82487002.

It is a self number, because there is not a number n which added to its sum of digits gives 20078428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147568 + ... + 147703.

It is an arithmetic number, because the mean of its divisors is an integer number (3100356).

Almost surely, 2^20078428 is an apocalyptic number.

It is an amenable number.

20078428 is a deficient number, since it is larger than the sum of its proper divisors (17125844).

20078428 is a wasteful number, since it uses less digits than its factorization.

20078428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295292 (or 295290 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20078428 is about 4480.8958925643. The cubic root of 20078428 is about 271.7961094572.

The spelling of 20078428 in words is "twenty million, seventy-eight thousand, four hundred twenty-eight".