20556374 has 4 divisors (see below), whose sum is σ = 30834564. Its totient is φ = 10278186.

The previous prime is 20556307. The next prime is 20556391. The reversal of 20556374 is 47365502.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20556374.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5139092 + ... + 5139095.

It is an arithmetic number, because the mean of its divisors is an integer number (7708641).

Almost surely, 2^20556374 is an apocalyptic number.

20556374 is a deficient number, since it is larger than the sum of its proper divisors (10278190).

20556374 is a wasteful number, since it uses less digits than its factorization.

20556374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10278189.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 20556374 is about 4533.9137618618. The cubic root of 20556374 is about 273.9358277621.

The spelling of 20556374 in words is "twenty million, five hundred fifty-six thousand, three hundred seventy-four".