20078738 has 8 divisors (see below), whose sum is σ = 30157680. Its totient is φ = 10026180.

The previous prime is 20078693. The next prime is 20078741. The reversal of 20078738 is 83787002.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20078698 and 20078707.

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, 4568 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (3769710).

Almost surely, 2^20078738 is an apocalyptic number.

20078738 is a deficient number, since it is larger than the sum of its proper divisors (10078942).

20078738 is a wasteful number, since it uses less digits than its factorization.

20078738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13192.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20078738 is about 4480.9304837277. The cubic root of 20078738 is about 271.7975082447.

The spelling of 20078738 in words is "twenty million, seventy-eight thousand, seven hundred thirty-eight".