20154901 has 4 divisors (see below), whose sum is σ = 21705292. Its totient is φ = 18604512.

The previous prime is 20154889. The next prime is 20154907. The reversal of 20154901 is 10945102.

20154901 = 3174² + 3175².

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

It can be written as a sum of positive squares in 2 ways, for example, as 10080625 + 10074276 = 3175^2 + 3174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20154901 - 2⁹ = 20154389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154907) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 775176 + ... + 775201.

It is an arithmetic number, because the mean of its divisors is an integer number (5426323).

Almost surely, 2^20154901 is an apocalyptic number.

20154901 is the 3175-th centered square number.

It is an amenable number.

20154901 is a deficient number, since it is larger than the sum of its proper divisors (1550391).

20154901 is a wasteful number, since it uses less digits than its factorization.

20154901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550390.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20154901 is about 4489.4210094399. The cubic root of 20154901 is about 272.1407368927.

The spelling of 20154901 in words is "twenty million, one hundred fifty-four thousand, nine hundred one".