20549458254 has 128 divisors (see below), whose sum is σ = 48130080768. Its totient is φ = 5791242240.

The previous prime is 20549458249. The next prime is 20549458309. The reversal of 20549458254 is 45285494502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21837424 + ... + 21838364.

It is an arithmetic number, because the mean of its divisors is an integer number (376016256).

Almost surely, 2^20549458254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20549458254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24065040384).

20549458254 is an abundant number, since it is smaller than the sum of its proper divisors (27580622514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20549458254 is a wasteful number, since it uses less digits than its factorization.

20549458254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402.

The product of its (nonzero) digits is 2304000, while the sum is 48.

The spelling of 20549458254 in words is "twenty billion, five hundred forty-nine million, four hundred fifty-eight thousand, two hundred fifty-four".