20945555431 has 8 divisors (see below), whose sum is σ = 21141253760. Its totient is φ = 20749921632.

The previous prime is 20945555419. The next prime is 20945555447. The reversal of 20945555431 is 13455554902.

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 20945555431 - 2⁹ = 20945554919 is a prime.

It is a super-2 number, since 2×20945555431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945555401) 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, 852586 + ... + 876808.

It is an arithmetic number, because the mean of its divisors is an integer number (2642656720).

Almost surely, 2^20945555431 is an apocalyptic number.

20945555431 is a deficient number, since it is larger than the sum of its proper divisors (195698329).

20945555431 is a wasteful number, since it uses less digits than its factorization.

20945555431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32265.

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 20945555431 in words is "twenty billion, nine hundred forty-five million, five hundred fifty-five thousand, four hundred thirty-one".