20789399 has 2 divisors, whose sum is σ = 20789400. Its totient is φ = 20789398.

The previous prime is 20789393. The next prime is 20789407. The reversal of 20789399 is 99398702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20789399 - 2¹⁶ = 20723863 is a prime.

It is a super-2 number, since 2×20789399² = 864398221562402, 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 (20789393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394699 + 10394700.

It is an arithmetic number, because the mean of its divisors is an integer number (10394700).

Almost surely, 2^20789399 is an apocalyptic number.

20789399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20789399 is an equidigital number, since it uses as much as digits as its factorization.

20789399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 20789399 is about 4559.5393407668. The cubic root of 20789399 is about 274.9670439846.

The spelling of 20789399 in words is "twenty million, seven hundred eighty-nine thousand, three hundred ninety-nine".