20643254061 has 8 divisors (see below), whose sum is σ = 27975557664. Its totient is φ = 13536559920.

The previous prime is 20643254057. The next prime is 20643254087. The reversal of 20643254061 is 16045234602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20643254061 - 2² = 20643254057 is a prime.

It is a super-2 number, since 2×20643254061² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643254461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56402151 + ... + 56402516.

It is an arithmetic number, because the mean of its divisors is an integer number (3496944708).

Almost surely, 2^20643254061 is an apocalyptic number.

It is an amenable number.

20643254061 is a deficient number, since it is larger than the sum of its proper divisors (7332303603).

20643254061 is a wasteful number, since it uses less digits than its factorization.

20643254061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112804731.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 20643254061 its reverse (16045234602), we get a palindrome (36688488663).

The spelling of 20643254061 in words is "twenty billion, six hundred forty-three million, two hundred fifty-four thousand, sixty-one".