20701819 has 2 divisors, whose sum is σ = 20701820. Its totient is φ = 20701818.

The previous prime is 20701789. The next prime is 20701823. The reversal of 20701819 is 91810702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20701819 - 2⁵ = 20701787 is a prime.

It is a super-2 number, since 2×20701819² = 857130619817522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20701319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350909 + 10350910.

It is an arithmetic number, because the mean of its divisors is an integer number (10350910).

Almost surely, 2^20701819 is an apocalyptic number.

20701819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20701819 is an equidigital number, since it uses as much as digits as its factorization.

20701819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20701819 is about 4549.9251642197. The cubic root of 20701819 is about 274.5803804183.

The spelling of 20701819 in words is "twenty million, seven hundred one thousand, eight hundred nineteen".