20755431 has 6 divisors (see below), whose sum is σ = 29980080. Its totient is φ = 13836948.

The previous prime is 20755421. The next prime is 20755447. The reversal of 20755431 is 13455702.

It is a happy number.

It is not a de Polignac number, because 20755431 - 2⁶ = 20755367 is a prime.

It is a super-2 number, since 2×20755431² = 861575831991522, which contains 22 as substring.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 20755395 and 20755404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1153071 + ... + 1153088.

It is an arithmetic number, because the mean of its divisors is an integer number (4996680).

Almost surely, 2^20755431 is an apocalyptic number.

20755431 is a deficient number, since it is larger than the sum of its proper divisors (9224649).

20755431 is a wasteful number, since it uses less digits than its factorization.

20755431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306165 (or 2306162 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20755431 is about 4555.8128802663. The cubic root of 20755431 is about 274.8172052435.

The spelling of 20755431 in words is "twenty million, seven hundred fifty-five thousand, four hundred thirty-one".