20778241 has 16 divisors (see below), whose sum is σ = 23295168. Its totient is φ = 18527520.

The previous prime is 20778211. The next prime is 20778253. The reversal of 20778241 is 14287702.

It is not a de Polignac number, because 20778241 - 2⁷ = 20778113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20778211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89061 + ... + 89293.

It is an arithmetic number, because the mean of its divisors is an integer number (1455948).

Almost surely, 2^20778241 is an apocalyptic number.

It is an amenable number.

20778241 is a deficient number, since it is larger than the sum of its proper divisors (2516927).

20778241 is an equidigital number, since it uses as much as digits as its factorization.

20778241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20778241 is about 4558.3155880215. The cubic root of 20778241 is about 274.9178421240.

The spelling of 20778241 in words is "twenty million, seven hundred seventy-eight thousand, two hundred forty-one".