20561634454 has 8 divisors (see below), whose sum is σ = 30860111448. Its totient is φ = 10274930640.

The previous prime is 20561634449. The next prime is 20561634469. The reversal of 20561634454 is 45443616502.

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

It is a super-2 number, since 2×20561634454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2938927 + ... + 2945914.

It is an arithmetic number, because the mean of its divisors is an integer number (3857513931).

Almost surely, 2^20561634454 is an apocalyptic number.

20561634454 is a deficient number, since it is larger than the sum of its proper divisors (10298476994).

20561634454 is a wasteful number, since it uses less digits than its factorization.

20561634454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5886590.

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 20561634454 in words is "twenty billion, five hundred sixty-one million, six hundred thirty-four thousand, four hundred fifty-four".