20351131102 has 4 divisors (see below), whose sum is σ = 30526696656. Its totient is φ = 10175565550.

The previous prime is 20351131063. The next prime is 20351131111. The reversal of 20351131102 is 20113115302.

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 20351131102.

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, 5087782774 + ... + 5087782777.

It is an arithmetic number, because the mean of its divisors is an integer number (7631674164).

Almost surely, 2^20351131102 is an apocalyptic number.

20351131102 is a deficient number, since it is larger than the sum of its proper divisors (10175565554).

20351131102 is a wasteful number, since it uses less digits than its factorization.

20351131102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10175565553.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 20351131102 its reverse (20113115302), we get a palindrome (40464246404).

The spelling of 20351131102 in words is "twenty billion, three hundred fifty-one million, one hundred thirty-one thousand, one hundred two".