20021154254 has 4 divisors (see below), whose sum is σ = 30031731384. Its totient is φ = 10010577126.

The previous prime is 20021154253. The next prime is 20021154367. The reversal of 20021154254 is 45245112002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021154253) 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 as a sum of consecutive naturals, namely, 5005288562 + ... + 5005288565.

It is an arithmetic number, because the mean of its divisors is an integer number (7507932846).

Almost surely, 2^20021154254 is an apocalyptic number.

20021154254 is a deficient number, since it is larger than the sum of its proper divisors (10010577130).

20021154254 is a wasteful number, since it uses less digits than its factorization.

20021154254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010577129.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20021154254 its reverse (45245112002), we get a palindrome (65266266256).

The spelling of 20021154254 in words is "twenty billion, twenty-one million, one hundred fifty-four thousand, two hundred fifty-four".