20628983 has 2 divisors, whose sum is σ = 20628984. Its totient is φ = 20628982.

The previous prime is 20628977. The next prime is 20629019. The reversal of 20628983 is 38982602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20628983 - 2²² = 16434679 is a prime.

It is a super-2 number, since 2×20628983² = 851109879228578, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20628683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314491 + 10314492.

It is an arithmetic number, because the mean of its divisors is an integer number (10314492).

Almost surely, 2^20628983 is an apocalyptic number.

20628983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628983 is an equidigital number, since it uses as much as digits as its factorization.

20628983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 20628983 is about 4541.9140238450. The cubic root of 20628983 is about 274.2579798062.

The spelling of 20628983 in words is "twenty million, six hundred twenty-eight thousand, nine hundred eighty-three".