20451077 has 2 divisors, whose sum is σ = 20451078. Its totient is φ = 20451076.

The previous prime is 20451073. The next prime is 20451089. The reversal of 20451077 is 77015402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16760836 + 3690241 = 4094^2 + 1921^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451077 - 2² = 20451073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225538 + 10225539.

It is an arithmetic number, because the mean of its divisors is an integer number (10225539).

Almost surely, 2^20451077 is an apocalyptic number.

It is an amenable number.

20451077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451077 is an equidigital number, since it uses as much as digits as its factorization.

20451077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20451077 is about 4522.2867003320. The cubic root of 20451077 is about 273.4672948671.

Adding to 20451077 its reverse (77015402), we get a palindrome (97466479).

The spelling of 20451077 in words is "twenty million, four hundred fifty-one thousand, seventy-seven".