20490983 has 2 divisors, whose sum is σ = 20490984. Its totient is φ = 20490982.

The previous prime is 20490979. The next prime is 20490997. The reversal of 20490983 is 38909402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20490983 - 2² = 20490979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20490973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10245491 + 10245492.

It is an arithmetic number, because the mean of its divisors is an integer number (10245492).

Almost surely, 2^20490983 is an apocalyptic number.

20490983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490983 is an equidigital number, since it uses as much as digits as its factorization.

20490983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20490983 is about 4526.6966984767. The cubic root of 20490983 is about 273.6450507120.

The spelling of 20490983 in words is "twenty million, four hundred ninety thousand, nine hundred eighty-three".