20654623 has 4 divisors (see below), whose sum is σ = 22532328. Its totient is φ = 18776920.

The previous prime is 20654617. The next prime is 20654659. The reversal of 20654623 is 32645602.

It is a happy number.

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 20654623 - 2⁵ = 20654591 is a prime.

It is a super-2 number, since 2×20654623² = 853226902544258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20654591 and 20654600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20654323) 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, 938836 + ... + 938857.

It is an arithmetic number, because the mean of its divisors is an integer number (5633082).

Almost surely, 2^20654623 is an apocalyptic number.

20654623 is a deficient number, since it is larger than the sum of its proper divisors (1877705).

20654623 is a wasteful number, since it uses less digits than its factorization.

20654623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877704.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20654623 is about 4544.7357458933. The cubic root of 20654623 is about 274.3715588944.

The spelling of 20654623 in words is "twenty million, six hundred fifty-four thousand, six hundred twenty-three".