20254012642 has 16 divisors (see below), whose sum is σ = 30552984000. Its totient is φ = 10069749360.

The previous prime is 20254012637. The next prime is 20254012643. The reversal of 20254012642 is 24621045202.

It is a self number, because there is not a number n which added to its sum of digits gives 20254012642.

It is not an unprimeable number, because it can be changed into a prime (20254012643) 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, 649017 + ... + 679507.

It is an arithmetic number, because the mean of its divisors is an integer number (1909561500).

Almost surely, 2^20254012642 is an apocalyptic number.

20254012642 is a deficient number, since it is larger than the sum of its proper divisors (10298971358).

20254012642 is a wasteful number, since it uses less digits than its factorization.

20254012642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32361.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 20254012642 its reverse (24621045202), we get a palindrome (44875057844).

The spelling of 20254012642 in words is "twenty billion, two hundred fifty-four million, twelve thousand, six hundred forty-two".