20623554 has 24 divisors (see below), whose sum is σ = 51068160. Its totient is φ = 5892408.

The previous prime is 20623513. The next prime is 20623573. The reversal of 20623554 is 45532602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81714 + ... + 81965.

It is an arithmetic number, because the mean of its divisors is an integer number (2127840).

Almost surely, 2^20623554 is an apocalyptic number.

20623554 is an abundant number, since it is smaller than the sum of its proper divisors (30444606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20623554 is a wasteful number, since it uses less digits than its factorization.

20623554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163694 (or 163691 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20623554 is about 4541.3163289954. The cubic root of 20623554 is about 274.2339185585.

The spelling of 20623554 in words is "twenty million, six hundred twenty-three thousand, five hundred fifty-four".