20931154 has 4 divisors (see below), whose sum is σ = 31396734. Its totient is φ = 10465576.

The previous prime is 20931151. The next prime is 20931187. The reversal of 20931154 is 45113902.

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

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 529 = 4575^2 + 23^2 .

It is a super-2 number, since 2×20931154² = 876226415543432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20931151) 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 as a sum of consecutive naturals, namely, 5232787 + ... + 5232790.

Almost surely, 2^20931154 is an apocalyptic number.

20931154 is a deficient number, since it is larger than the sum of its proper divisors (10465580).

20931154 is a wasteful number, since it uses less digits than its factorization.

20931154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465579.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20931154 is about 4575.0578138424. The cubic root of 20931154 is about 275.5905940843.

The spelling of 20931154 in words is "twenty million, nine hundred thirty-one thousand, one hundred fifty-four".