20426154661 has 4 divisors (see below), whose sum is σ = 22283077824. Its totient is φ = 18569231500.

The previous prime is 20426154659. The next prime is 20426154677. The reversal of 20426154661 is 16645162402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20426154661 - 2¹ = 20426154659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20426154661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426154641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928461565 + ... + 928461586.

It is an arithmetic number, because the mean of its divisors is an integer number (5570769456).

Almost surely, 2^20426154661 is an apocalyptic number.

It is an amenable number.

20426154661 is a deficient number, since it is larger than the sum of its proper divisors (1856923163).

20426154661 is a wasteful number, since it uses less digits than its factorization.

20426154661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856923162.

The product of its (nonzero) digits is 69120, while the sum is 37.

It can be divided in two parts, 2042615 and 4661, that added together give a triangular number (2047276 = T₂₀₂₃).

The spelling of 20426154661 in words is "twenty billion, four hundred twenty-six million, one hundred fifty-four thousand, six hundred sixty-one".