20712431 has 2 divisors, whose sum is σ = 20712432. Its totient is φ = 20712430.

The previous prime is 20712403. The next prime is 20712437. The reversal of 20712431 is 13421702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20712431 - 2¹⁰ = 20711407 is a prime.

It is a super-2 number, since 2×20712431² = 858009595859522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356215 + 10356216.

It is an arithmetic number, because the mean of its divisors is an integer number (10356216).

Almost surely, 2^20712431 is an apocalyptic number.

20712431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712431 is an equidigital number, since it uses as much as digits as its factorization.

20712431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20712431 is about 4551.0911878362. The cubic root of 20712431 is about 274.6272901326.

The spelling of 20712431 in words is "twenty million, seven hundred twelve thousand, four hundred thirty-one".