20645460431 has 8 divisors (see below), whose sum is σ = 21058076304. Its totient is φ = 20235237120.

The previous prime is 20645460427. The next prime is 20645460461. The reversal of 20645460431 is 13406454602.

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 20645460431 - 2² = 20645460427 is a prime.

It is a super-2 number, since 2×20645460431² (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 = 20645460391 and 20645460400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645460461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580706 + ... + 615231.

It is an arithmetic number, because the mean of its divisors is an integer number (2632259538).

Almost surely, 2^20645460431 is an apocalyptic number.

20645460431 is a deficient number, since it is larger than the sum of its proper divisors (412615873).

20645460431 is a wasteful number, since it uses less digits than its factorization.

20645460431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196281.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 20645460431 in words is "twenty billion, six hundred forty-five million, four hundred sixty thousand, four hundred thirty-one".