20535451231 has 8 divisors (see below), whose sum is σ = 20615703824. Its totient is φ = 20455243200.

The previous prime is 20535451213. The next prime is 20535451247. The reversal of 20535451231 is 13215453502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20535451231 is a prime.

It is a super-2 number, since 2×20535451231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20535451193 and 20535451202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535451331) 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, 1141456 + ... + 1159306.

It is an arithmetic number, because the mean of its divisors is an integer number (2576962978).

Almost surely, 2^20535451231 is an apocalyptic number.

20535451231 is a deficient number, since it is larger than the sum of its proper divisors (80252593).

20535451231 is a wasteful number, since it uses less digits than its factorization.

20535451231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22281.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 20535451231 in words is "twenty billion, five hundred thirty-five million, four hundred fifty-one thousand, two hundred thirty-one".