20778803 has 2 divisors, whose sum is σ = 20778804. Its totient is φ = 20778802.

The previous prime is 20778787. The next prime is 20778833. The reversal of 20778803 is 30887702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20778803 - 2⁴ = 20778787 is a prime.

It is a super-2 number, since 2×20778803² = 863517308225618, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20778833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389401 + 10389402.

It is an arithmetic number, because the mean of its divisors is an integer number (10389402).

Almost surely, 2^20778803 is an apocalyptic number.

20778803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20778803 is an equidigital number, since it uses as much as digits as its factorization.

20778803 is an evil number, because the sum of its binary digits is even.

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

The square root of 20778803 is about 4558.3772331829. The cubic root of 20778803 is about 274.9203207174.

The spelling of 20778803 in words is "twenty million, seven hundred seventy-eight thousand, eight hundred three".