20742030665 has 16 divisors (see below), whose sum is σ = 25064926608. Its totient is φ = 16477433856.

The previous prime is 20742030623. The next prime is 20742030671. The reversal of 20742030665 is 56603024702.

It can be written as a sum of positive squares in 8 ways, for example, as 4675961161 + 16066069504 = 68381^2 + 126752^2 .

It is not a de Polignac number, because 20742030665 - 2¹⁰ = 20742029641 is a prime.

It is a super-2 number, since 2×20742030665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1368569 + ... + 1383641.

It is an arithmetic number, because the mean of its divisors is an integer number (1566557913).

Almost surely, 2^20742030665 is an apocalyptic number.

It is an amenable number.

20742030665 is a deficient number, since it is larger than the sum of its proper divisors (4322895943).

20742030665 is a wasteful number, since it uses less digits than its factorization.

20742030665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16988.

The product of its (nonzero) digits is 60480, while the sum is 35.

The spelling of 20742030665 in words is "twenty billion, seven hundred forty-two million, thirty thousand, six hundred sixty-five".