20420723 has 8 divisors (see below), whose sum is σ = 22320000. Its totient is φ = 18599040.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420723 is 32702402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20420723 - 2²⁰ = 19372147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20420695 and 20420704.

It is not an unprimeable number, because it can be changed into a prime (20420773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18848 + ... + 19901.

It is an arithmetic number, because the mean of its divisors is an integer number (2790000).

Almost surely, 2^20420723 is an apocalyptic number.

20420723 is a deficient number, since it is larger than the sum of its proper divisors (1899277).

20420723 is a wasteful number, since it uses less digits than its factorization.

20420723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38797.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20420723 is about 4518.9294086100. The cubic root of 20420723 is about 273.3319322091.

It can be divided in two parts, 2042072 and 3, that multiplied together give a palindrome (6126216).

The spelling of 20420723 in words is "twenty million, four hundred twenty thousand, seven hundred twenty-three".