20623355 has 4 divisors (see below), whose sum is σ = 24748032. Its totient is φ = 16498680.

The previous prime is 20623349. The next prime is 20623373. The reversal of 20623355 is 55332602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20623355 - 2¹⁶ = 20557819 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062331 + ... + 2062340.

It is an arithmetic number, because the mean of its divisors is an integer number (6187008).

Almost surely, 2^20623355 is an apocalyptic number.

20623355 is a deficient number, since it is larger than the sum of its proper divisors (4124677).

20623355 is an equidigital number, since it uses as much as digits as its factorization.

20623355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124676.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 20623355 is about 4541.2944189955. The cubic root of 20623355 is about 274.2330365132.

Adding to 20623355 its reverse (55332602), we get a palindrome (75955957).

The spelling of 20623355 in words is "twenty million, six hundred twenty-three thousand, three hundred fifty-five".