20542703 has 4 divisors (see below), whose sum is σ = 21435888. Its totient is φ = 19649520.

The previous prime is 20542673. The next prime is 20542729. The reversal of 20542703 is 30724502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30724502 = 2 ⋅15362251.

It is a cyclic number.

It is not a de Polignac number, because 20542703 - 2⁸ = 20542447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 893161 = 20542703 / (2 + 0 + 5 + 4 + 2 + 7 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542603) 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, 446558 + ... + 446603.

It is an arithmetic number, because the mean of its divisors is an integer number (5358972).

Almost surely, 2^20542703 is an apocalyptic number.

20542703 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20542703 is a deficient number, since it is larger than the sum of its proper divisors (893185).

20542703 is an equidigital number, since it uses as much as digits as its factorization.

20542703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893184.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20542703 is about 4532.4058732642. The cubic root of 20542703 is about 273.8750873610.

The spelling of 20542703 in words is "twenty million, five hundred forty-two thousand, seven hundred three".