20742341651 has 4 divisors (see below), whose sum is σ = 20879708304. Its totient is φ = 20604975000.

The previous prime is 20742341603. The next prime is 20742341657. The reversal of 20742341651 is 15614324702.

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

It is a cyclic number.

It is not a de Polignac number, because 20742341651 - 2³⁴ = 3562472467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20742341657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68683100 + ... + 68683401.

It is an arithmetic number, because the mean of its divisors is an integer number (5219927076).

Almost surely, 2^20742341651 is an apocalyptic number.

20742341651 is a deficient number, since it is larger than the sum of its proper divisors (137366653).

20742341651 is a wasteful number, since it uses less digits than its factorization.

20742341651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137366652.

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 20742341651 in words is "twenty billion, seven hundred forty-two million, three hundred forty-one thousand, six hundred fifty-one".