20541013642 has 4 divisors (see below), whose sum is σ = 30811520466. Its totient is φ = 10270506820.

The previous prime is 20541013609. The next prime is 20541013643. The reversal of 20541013642 is 24631014502.

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

It can be written as a sum of positive squares in only one way, i.e., 16592273721 + 3948739921 = 128811^2 + 62839^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20541013642.

It is not an unprimeable number, because it can be changed into a prime (20541013643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135253409 + ... + 5135253412.

Almost surely, 2^20541013642 is an apocalyptic number.

20541013642 is a deficient number, since it is larger than the sum of its proper divisors (10270506824).

20541013642 is a wasteful number, since it uses less digits than its factorization.

20541013642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270506823.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 20541013642 in words is "twenty billion, five hundred forty-one million, thirteen thousand, six hundred forty-two".