20434949431 has 16 divisors (see below), whose sum is σ = 22483699840. Its totient is φ = 18457528320.

The previous prime is 20434949417. The next prime is 20434949453. The reversal of 20434949431 is 13494943402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434949431 is a prime.

It is a super-2 number, since 2×20434949431² (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 (20434949461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86290 + ... + 219808.

It is an arithmetic number, because the mean of its divisors is an integer number (1405231240).

Almost surely, 2^20434949431 is an apocalyptic number.

20434949431 is a deficient number, since it is larger than the sum of its proper divisors (2048750409).

20434949431 is a wasteful number, since it uses less digits than its factorization.

20434949431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133786.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 20434949431 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-nine thousand, four hundred thirty-one".