20448977 has 4 divisors (see below), whose sum is σ = 21651876. Its totient is φ = 19246080.

The previous prime is 20448949. The next prime is 20448991. The reversal of 20448977 is 77984402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77984402 = 2 ⋅38992201.

It can be written as a sum of positive squares in 2 ways, for example, as 17048641 + 3400336 = 4129^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 20448977 - 2⁸ = 20448721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20448917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601424 + ... + 601457.

It is an arithmetic number, because the mean of its divisors is an integer number (5412969).

Almost surely, 2^20448977 is an apocalyptic number.

It is an amenable number.

20448977 is a deficient number, since it is larger than the sum of its proper divisors (1202899).

20448977 is a wasteful number, since it uses less digits than its factorization.

20448977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202898.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20448977 is about 4522.0545109496. The cubic root of 20448977 is about 273.4579343009.

The spelling of 20448977 in words is "twenty million, four hundred forty-eight thousand, nine hundred seventy-seven".