20642464623 has 16 divisors (see below), whose sum is σ = 30028534272. Its totient is φ = 12509280000.

The previous prime is 20642464607. The next prime is 20642464637. The reversal of 20642464623 is 32646424602.

It is not a de Polignac number, because 20642464623 - 2⁴ = 20642464607 is a prime.

It is a super-2 number, since 2×20642464623² (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 (20642462623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358698 + ... + 412248.

It is an arithmetic number, because the mean of its divisors is an integer number (1876783392).

Almost surely, 2^20642464623 is an apocalyptic number.

20642464623 is a deficient number, since it is larger than the sum of its proper divisors (9386069649).

20642464623 is a wasteful number, since it uses less digits than its factorization.

20642464623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65246.

The product of its (nonzero) digits is 331776, while the sum is 39.

The spelling of 20642464623 in words is "twenty billion, six hundred forty-two million, four hundred sixty-four thousand, six hundred twenty-three".