20798623 has 2 divisors, whose sum is σ = 20798624. Its totient is φ = 20798622.

The previous prime is 20798611. The next prime is 20798639. The reversal of 20798623 is 32689702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20798623 - 2¹³ = 20790431 is a prime.

It is a super-2 number, since 2×20798623² = 865165437392258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20798653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399311 + 10399312.

It is an arithmetic number, because the mean of its divisors is an integer number (10399312).

Almost surely, 2^20798623 is an apocalyptic number.

20798623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20798623 is an equidigital number, since it uses as much as digits as its factorization.

20798623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20798623 is about 4560.5507342864. The cubic root of 20798623 is about 275.0077044673.

The spelling of 20798623 in words is "twenty million, seven hundred ninety-eight thousand, six hundred twenty-three".