20753431 has 4 divisors (see below), whose sum is σ = 20811600. Its totient is φ = 20695264.

The previous prime is 20753419. The next prime is 20753443. The reversal of 20753431 is 13435702.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20753419) and next prime (20753443).

It is a cyclic number.

It is not a de Polignac number, because 20753431 - 2⁷ = 20753303 is a prime.

It is a super-2 number, since 2×20753431² = 861409796543522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20753396 and 20753405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20753401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28546 + ... + 29263.

It is an arithmetic number, because the mean of its divisors is an integer number (5202900).

Almost surely, 2^20753431 is an apocalyptic number.

20753431 is a deficient number, since it is larger than the sum of its proper divisors (58169).

20753431 is an equidigital number, since it uses as much as digits as its factorization.

20753431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58168.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20753431 is about 4555.5933751818. The cubic root of 20753431 is about 274.8083778019.

The spelling of 20753431 in words is "twenty million, seven hundred fifty-three thousand, four hundred thirty-one".