20273815 has 4 divisors (see below), whose sum is σ = 24328584. Its totient is φ = 16219048.

The previous prime is 20273791. The next prime is 20273819. The reversal of 20273815 is 51837202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20273815 - 2⁹ = 20273303 is a prime.

It is a super-2 number, since 2×20273815² = 822055149308450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20273819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027377 + ... + 2027386.

It is an arithmetic number, because the mean of its divisors is an integer number (6082146).

Almost surely, 2^20273815 is an apocalyptic number.

20273815 is a deficient number, since it is larger than the sum of its proper divisors (4054769).

20273815 is an equidigital number, since it uses as much as digits as its factorization.

20273815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054768.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20273815 is about 4502.6453335789. The cubic root of 20273815 is about 272.6748982423.

The spelling of 20273815 in words is "twenty million, two hundred seventy-three thousand, eight hundred fifteen".