20778802 has 8 divisors (see below), whose sum is σ = 34001712. Its totient is φ = 9444900.

The previous prime is 20778787. The next prime is 20778803. The reversal of 20778802 is 20887702.

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

It is a super-2 number, since 2×20778802² = 863517225110408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20778803) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 472224 + ... + 472267.

It is an arithmetic number, because the mean of its divisors is an integer number (4250214).

Almost surely, 2^20778802 is an apocalyptic number.

20778802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20778802 is a deficient number, since it is larger than the sum of its proper divisors (13222910).

20778802 is a wasteful number, since it uses less digits than its factorization.

20778802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944504.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 20778802 is about 4558.3771234947. The cubic root of 20778802 is about 274.9203163071.

Subtracting 20778802 from its reverse (20887702), we obtain a square (108900 = 330²).

The spelling of 20778802 in words is "twenty million, seven hundred seventy-eight thousand, eight hundred two".