20621683 has 2 divisors, whose sum is σ = 20621684. Its totient is φ = 20621682.

The previous prime is 20621677. The next prime is 20621693. The reversal of 20621683 is 38612602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20621683 - 2⁹ = 20621171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20621693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310841 + 10310842.

It is an arithmetic number, because the mean of its divisors is an integer number (10310842).

Almost surely, 2^20621683 is an apocalyptic number.

20621683 is a deficient number, since it is larger than the sum of its proper divisors (1).

20621683 is an equidigital number, since it uses as much as digits as its factorization.

20621683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20621683 is about 4541.1103267813. The cubic root of 20621683 is about 274.2256253358.

The spelling of 20621683 in words is "twenty million, six hundred twenty-one thousand, six hundred eighty-three".