20122667561 has 8 divisors (see below), whose sum is σ = 20739354240. Its totient is φ = 19513837008.

The previous prime is 20122667483. The next prime is 20122667629. The reversal of 20122667561 is 16576622102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20122667561 - 2³⁴ = 2942798377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20122664561) 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, 1958831 + ... + 1969076.

It is an arithmetic number, because the mean of its divisors is an integer number (2592419280).

Almost surely, 2^20122667561 is an apocalyptic number.

It is an amenable number.

20122667561 is a deficient number, since it is larger than the sum of its proper divisors (616686679).

20122667561 is a wasteful number, since it uses less digits than its factorization.

20122667561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928063.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 20122667561 in words is "twenty billion, one hundred twenty-two million, six hundred sixty-seven thousand, five hundred sixty-one".