20407553 has 2 divisors, whose sum is σ = 20407554. Its totient is φ = 20407552.

The previous prime is 20407547. The next prime is 20407559. The reversal of 20407553 is 35570402.

It is a balanced prime because it is at equal distance from previous prime (20407547) and next prime (20407559).

It can be written as a sum of positive squares in only one way, i.e., 12159169 + 8248384 = 3487^2 + 2872^2 .

It is a cyclic number.

It is not a de Polignac number, because 20407553 - 2⁴ = 20407537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20407559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203776 + 10203777.

It is an arithmetic number, because the mean of its divisors is an integer number (10203777).

Almost surely, 2^20407553 is an apocalyptic number.

It is an amenable number.

20407553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20407553 is an equidigital number, since it uses as much as digits as its factorization.

20407553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20407553 is about 4517.4719700293. The cubic root of 20407553 is about 273.2731593031.

Adding to 20407553 its reverse (35570402), we get a palindrome (55977955).

The spelling of 20407553 in words is "twenty million, four hundred seven thousand, five hundred fifty-three".