20422993 has 2 divisors, whose sum is σ = 20422994. Its totient is φ = 20422992.

The previous prime is 20422951. The next prime is 20423023. The reversal of 20422993 is 39922402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14961424 + 5461569 = 3868^2 + 2337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20422993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20422903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211496 + 10211497.

It is an arithmetic number, because the mean of its divisors is an integer number (10211497).

Almost surely, 2^20422993 is an apocalyptic number.

It is an amenable number.

20422993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422993 is an equidigital number, since it uses as much as digits as its factorization.

20422993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20422993 is about 4519.1805673153. The cubic root of 20422993 is about 273.3420598377.

The spelling of 20422993 in words is "twenty million, four hundred twenty-two thousand, nine hundred ninety-three".