20533693 has 2 divisors, whose sum is σ = 20533694. Its totient is φ = 20533692.

The previous prime is 20533679. The next prime is 20533703. The reversal of 20533693 is 39633502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15984004 + 4549689 = 3998^2 + 2133^2 .

It is a cyclic number.

It is not a de Polignac number, because 20533693 - 2¹³ = 20525501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20533613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266846 + 10266847.

It is an arithmetic number, because the mean of its divisors is an integer number (10266847).

Almost surely, 2^20533693 is an apocalyptic number.

It is an amenable number.

20533693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533693 is an equidigital number, since it uses as much as digits as its factorization.

20533693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 31.

The square root of 20533693 is about 4531.4118109040. The cubic root of 20533693 is about 273.8350410992.

The spelling of 20533693 in words is "twenty million, five hundred thirty-three thousand, six hundred ninety-three".