20154312061 has 8 divisors (see below), whose sum is σ = 21928404344. Its totient is φ = 18412185600.

The previous prime is 20154312053. The next prime is 20154312103. The reversal of 20154312061 is 16021345102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 440748036 + 19713564025 = 20994^2 + 140405^2 .

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 20154312061 - 2³ = 20154312053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154312041) 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, 7990140 + ... + 7992661.

It is an arithmetic number, because the mean of its divisors is an integer number (2741050543).

Almost surely, 2^20154312061 is an apocalyptic number.

It is an amenable number.

20154312061 is a deficient number, since it is larger than the sum of its proper divisors (1774092283).

20154312061 is a wasteful number, since it uses less digits than its factorization.

20154312061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15982911.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 20154312061 its reverse (16021345102), we get a palindrome (36175657163).

The spelling of 20154312061 in words is "twenty billion, one hundred fifty-four million, three hundred twelve thousand, sixty-one".