20702623 has 4 divisors (see below), whose sum is σ = 20788768. Its totient is φ = 20616480.

The previous prime is 20702621. The next prime is 20702639. The reversal of 20702623 is 32620702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32620702 = 2 ⋅16310351.

It is a cyclic number.

It is not a de Polignac number, because 20702623 - 2¹ = 20702621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20702594 and 20702603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20702621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42711 + ... + 43192.

It is an arithmetic number, because the mean of its divisors is an integer number (5197192).

Almost surely, 2^20702623 is an apocalyptic number.

20702623 is a deficient number, since it is larger than the sum of its proper divisors (86145).

20702623 is an equidigital number, since it uses as much as digits as its factorization.

20702623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86144.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20702623 is about 4550.0135164634. The cubic root of 20702623 is about 274.5839350136.

The spelling of 20702623 in words is "twenty million, seven hundred two thousand, six hundred twenty-three".