20523974 has 16 divisors (see below), whose sum is σ = 31750368. Its totient is φ = 9942912.

The previous prime is 20523973. The next prime is 20523983. The reversal of 20523974 is 47932502.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20523974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523973) 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, 24527 + ... + 25349.

It is an arithmetic number, because the mean of its divisors is an integer number (1984398).

Almost surely, 2^20523974 is an apocalyptic number.

20523974 is a deficient number, since it is larger than the sum of its proper divisors (11226394).

20523974 is a wasteful number, since it uses less digits than its factorization.

20523974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20523974 is about 4530.3392808928. The cubic root of 20523974 is about 273.7918304474.

The spelling of 20523974 in words is "twenty million, five hundred twenty-three thousand, nine hundred seventy-four".