20259212542 has 4 divisors (see below), whose sum is σ = 30388818816. Its totient is φ = 10129606270.

The previous prime is 20259212539. The next prime is 20259212627. The reversal of 20259212542 is 24521295202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24521295202 = 2 ⋅12260647601.

It is a junction number, because it is equal to n+sod(n) for n = 20259212498 and 20259212507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064803134 + ... + 5064803137.

It is an arithmetic number, because the mean of its divisors is an integer number (7597204704).

Almost surely, 2^20259212542 is an apocalyptic number.

20259212542 is a deficient number, since it is larger than the sum of its proper divisors (10129606274).

20259212542 is a wasteful number, since it uses less digits than its factorization.

20259212542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129606273.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 20259212542 in words is "twenty billion, two hundred fifty-nine million, two hundred twelve thousand, five hundred forty-two".