20954658661 has 8 divisors (see below), whose sum is σ = 21891227904. Its totient is φ = 20034377760.

The previous prime is 20954658629. The next prime is 20954658671. The reversal of 20954658661 is 16685645902.

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 20954658661 - 2⁵ = 20954658629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20954658599 and 20954658608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20954658671) 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, 4069456 + ... + 4074601.

It is an arithmetic number, because the mean of its divisors is an integer number (2736403488).

Almost surely, 2^20954658661 is an apocalyptic number.

It is an amenable number.

20954658661 is a deficient number, since it is larger than the sum of its proper divisors (936569243).

20954658661 is an equidigital number, since it uses as much as digits as its factorization.

20954658661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8144171.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 20954658661 in words is "twenty billion, nine hundred fifty-four million, six hundred fifty-eight thousand, six hundred sixty-one".