20356672461 has 8 divisors (see below), whose sum is σ = 27151546464. Its totient is φ = 13566456720.

The previous prime is 20356672439. The next prime is 20356672463. The reversal of 20356672461 is 16427665302.

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

It is not a de Polignac number, because 20356672461 - 2⁵ = 20356672429 is a prime.

It is a super-2 number, since 2×20356672461² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356672463) 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, 1154355 + ... + 1171856.

It is an arithmetic number, because the mean of its divisors is an integer number (3393943308).

Almost surely, 2^20356672461 is an apocalyptic number.

It is an amenable number.

20356672461 is a deficient number, since it is larger than the sum of its proper divisors (6794874003).

20356672461 is a wasteful number, since it uses less digits than its factorization.

20356672461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329131.

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 20356672461 in words is "twenty billion, three hundred fifty-six million, six hundred seventy-two thousand, four hundred sixty-one".