20017977 has 8 divisors (see below), whose sum is σ = 30503616. Its totient is φ = 11438832.

The previous prime is 20017973. The next prime is 20017997. The reversal of 20017977 is 77971002.

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

It is not a de Polignac number, because 20017977 - 2² = 20017973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20017973) 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 7 ways as a sum of consecutive naturals, for example, 476598 + ... + 476639.

It is an arithmetic number, because the mean of its divisors is an integer number (3812952).

Almost surely, 2^20017977 is an apocalyptic number.

It is an amenable number.

20017977 is a deficient number, since it is larger than the sum of its proper divisors (10485639).

20017977 is an equidigital number, since it uses as much as digits as its factorization.

20017977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953247.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 20017977 is about 4474.1453932567. The cubic root of 20017977 is about 271.5230657801.

Adding to 20017977 its reverse (77971002), we get a palindrome (97988979).

The spelling of 20017977 in words is "twenty million, seventeen thousand, nine hundred seventy-seven".