20961998054 has 4 divisors (see below), whose sum is σ = 31442997084. Its totient is φ = 10480999026.

The previous prime is 20961998023. The next prime is 20961998063. The reversal of 20961998054 is 45089916902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45089916902 = 2 ⋅22544958451.

It is a junction number, because it is equal to n+sod(n) for n = 20961997987 and 20961998005.

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 as a sum of consecutive naturals, namely, 5240499512 + ... + 5240499515.

It is an arithmetic number, because the mean of its divisors is an integer number (7860749271).

Almost surely, 2^20961998054 is an apocalyptic number.

20961998054 is a deficient number, since it is larger than the sum of its proper divisors (10480999030).

20961998054 is a wasteful number, since it uses less digits than its factorization.

20961998054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10480999029.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 20961998054 in words is "twenty billion, nine hundred sixty-one million, nine hundred ninety-eight thousand, fifty-four".