20139356486 has 4 divisors (see below), whose sum is σ = 30209034732. Its totient is φ = 10069678242.

The previous prime is 20139356473. The next prime is 20139356507. The reversal of 20139356486 is 68465393102.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20139356486.

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, 5034839120 + ... + 5034839123.

It is an arithmetic number, because the mean of its divisors is an integer number (7552258683).

Almost surely, 2^20139356486 is an apocalyptic number.

20139356486 is a deficient number, since it is larger than the sum of its proper divisors (10069678246).

20139356486 is a wasteful number, since it uses less digits than its factorization.

20139356486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069678245.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 20139356486 in words is "twenty billion, one hundred thirty-nine million, three hundred fifty-six thousand, four hundred eighty-six".