20754778 has 16 divisors (see below), whose sum is σ = 35134560. Its totient is φ = 9108400.

The previous prime is 20754761. The next prime is 20754787. The reversal of 20754778 is 87745702.

It is a self number, because there is not a number n which added to its sum of digits gives 20754778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15628 + ... + 16903.

It is an arithmetic number, because the mean of its divisors is an integer number (2195910).

Almost surely, 2^20754778 is an apocalyptic number.

20754778 is a deficient number, since it is larger than the sum of its proper divisors (14379782).

20754778 is a wasteful number, since it uses less digits than its factorization.

20754778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32573.

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 20754778 is about 4555.7412130190. The cubic root of 20754778 is about 274.8143231462.

The spelling of 20754778 in words is "twenty million, seven hundred fifty-four thousand, seven hundred seventy-eight".