20420695 has 4 divisors (see below), whose sum is σ = 24504840. Its totient is φ = 16336552.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420695 is 59602402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59602402 = 2 ⋅29801201.

It is a cyclic number.

It is not a de Polignac number, because 20420695 - 2⁷ = 20420567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2042065 + ... + 2042074.

It is an arithmetic number, because the mean of its divisors is an integer number (6126210).

Almost surely, 2^20420695 is an apocalyptic number.

20420695 is a deficient number, since it is larger than the sum of its proper divisors (4084145).

20420695 is an equidigital number, since it uses as much as digits as its factorization.

20420695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084144.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20420695 is about 4518.9263105300. The cubic root of 20420695 is about 273.3318072821.

It can be divided in two parts, 20420 and 695, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20420695 in words is "twenty million, four hundred twenty thousand, six hundred ninety-five".