20434256753 has 4 divisors (see below), whose sum is σ = 20461908720. Its totient is φ = 20406604788.

The previous prime is 20434256707. The next prime is 20434256861. The reversal of 20434256753 is 35765243402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20434256753 - 2⁸ = 20434256497 is a prime.

It is a super-2 number, since 2×20434256753² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20434256753.

It is not an unprimeable number, because it can be changed into a prime (20434256153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13824875 + ... + 13826352.

It is an arithmetic number, because the mean of its divisors is an integer number (5115477180).

Almost surely, 2^20434256753 is an apocalyptic number.

It is an amenable number.

20434256753 is a deficient number, since it is larger than the sum of its proper divisors (27651967).

20434256753 is an equidigital number, since it uses as much as digits as its factorization.

20434256753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27651966.

The product of its (nonzero) digits is 604800, while the sum is 41.

The spelling of 20434256753 in words is "twenty billion, four hundred thirty-four million, two hundred fifty-six thousand, seven hundred fifty-three".