20146779 has 8 divisors (see below), whose sum is σ = 29847120. Its totient is φ = 13431168.

The previous prime is 20146757. The next prime is 20146787. The reversal of 20146779 is 97764102.

It is a happy number.

It is not a de Polignac number, because 20146779 - 2⁸ = 20146523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20146279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373062 + ... + 373115.

It is an arithmetic number, because the mean of its divisors is an integer number (3730890).

Almost surely, 2^20146779 is an apocalyptic number.

20146779 is a deficient number, since it is larger than the sum of its proper divisors (9700341).

20146779 is an equidigital number, since it uses as much as digits as its factorization.

20146779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746186 (or 746180 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20146779 is about 4488.5163473023. The cubic root of 20146779 is about 272.1041763222.

The spelling of 20146779 in words is "twenty million, one hundred forty-six thousand, seven hundred seventy-nine".