20623531 has 8 divisors (see below), whose sum is σ = 22214720. Its totient is φ = 19082952.

The previous prime is 20623513. The next prime is 20623573. The reversal of 20623531 is 13532602.

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 20623531 - 2¹⁵ = 20590763 is a prime.

It is a super-2 number, since 2×20623531² = 850660061815922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20623231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11805 + ... + 13438.

It is an arithmetic number, because the mean of its divisors is an integer number (2776840).

Almost surely, 2^20623531 is an apocalyptic number.

20623531 is a deficient number, since it is larger than the sum of its proper divisors (1591189).

20623531 is a wasteful number, since it uses less digits than its factorization.

20623531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25305.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20623531 is about 4541.3137966892. The cubic root of 20623531 is about 274.2338166139.

The spelling of 20623531 in words is "twenty million, six hundred twenty-three thousand, five hundred thirty-one".