20926553 has 2 divisors, whose sum is σ = 20926554. Its totient is φ = 20926552.

The previous prime is 20926537. The next prime is 20926559. The reversal of 20926553 is 35562902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16711744 + 4214809 = 4088^2 + 2053^2 .

It is a cyclic number.

It is not a de Polignac number, because 20926553 - 2⁴ = 20926537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20926559) 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 as a sum of consecutive naturals, namely, 10463276 + 10463277.

It is an arithmetic number, because the mean of its divisors is an integer number (10463277).

Almost surely, 2^20926553 is an apocalyptic number.

It is an amenable number.

20926553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20926553 is an equidigital number, since it uses as much as digits as its factorization.

20926553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 20926553 is about 4574.5549510308. The cubic root of 20926553 is about 275.5703995417.

It can be divided in two parts, 209 and 26553, that added together give a palindrome (26762).

The spelling of 20926553 in words is "twenty million, nine hundred twenty-six thousand, five hundred fifty-three".