20750431 has 16 divisors (see below), whose sum is σ = 22998528. Its totient is φ = 18604800.

The previous prime is 20750423. The next prime is 20750441. The reversal of 20750431 is 13405702.

It is a cyclic number.

It is not a de Polignac number, because 20750431 - 2³ = 20750423 is a prime.

It is a super-2 number, since 2×20750431² = 861160773371522, which 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 (20750441) 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 15 ways as a sum of consecutive naturals, for example, 108546 + ... + 108736.

It is an arithmetic number, because the mean of its divisors is an integer number (1437408).

Almost surely, 2^20750431 is an apocalyptic number.

20750431 is a deficient number, since it is larger than the sum of its proper divisors (2248097).

20750431 is a wasteful number, since it uses less digits than its factorization.

20750431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20750431 is about 4555.2640977225. The cubic root of 20750431 is about 274.7951355761.

The spelling of 20750431 in words is "twenty million, seven hundred fifty thousand, four hundred thirty-one".