20668154 has 16 divisors (see below), whose sum is σ = 33475680. Its totient is φ = 9513840.

The previous prime is 20668147. The next prime is 20668157. The reversal of 20668154 is 45186602.

It is a self number, because there is not a number n which added to its sum of digits gives 20668154.

It is not an unprimeable number, because it can be changed into a prime (20668157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11957 + ... + 13575.

It is an arithmetic number, because the mean of its divisors is an integer number (2092230).

Almost surely, 2^20668154 is an apocalyptic number.

20668154 is a deficient number, since it is larger than the sum of its proper divisors (12807526).

20668154 is a wasteful number, since it uses less digits than its factorization.

20668154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20668154 is about 4546.2241475757. The cubic root of 20668154 is about 274.4314601113.

The spelling of 20668154 in words is "twenty million, six hundred sixty-eight thousand, one hundred fifty-four".