20554517 has 2 divisors, whose sum is σ = 20554518. Its totient is φ = 20554516.

The previous prime is 20554493. The next prime is 20554529. The reversal of 20554517 is 71545502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17023876 + 3530641 = 4126^2 + 1879^2 .

It is a cyclic number.

It is not a de Polignac number, because 20554517 - 2⁶ = 20554453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20554517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20554217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277258 + 10277259.

It is an arithmetic number, because the mean of its divisors is an integer number (10277259).

Almost surely, 2^20554517 is an apocalyptic number.

It is an amenable number.

20554517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554517 is an equidigital number, since it uses as much as digits as its factorization.

20554517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 20554517 is about 4533.7089672805. The cubic root of 20554517 is about 273.9275786719.

The spelling of 20554517 in words is "twenty million, five hundred fifty-four thousand, five hundred seventeen".