20780078 has 16 divisors (see below), whose sum is σ = 34083504. Its totient is φ = 9423360.

The previous prime is 20780059. The next prime is 20780093. The reversal of 20780078 is 87008702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11876 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (2130219).

Almost surely, 2^20780078 is an apocalyptic number.

20780078 is a deficient number, since it is larger than the sum of its proper divisors (13303426).

20780078 is a wasteful number, since it uses less digits than its factorization.

20780078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 20780078 is about 4558.5170834384. The cubic root of 20780078 is about 274.9259436951.

The spelling of 20780078 in words is "twenty million, seven hundred eighty thousand, seventy-eight".