20245831 has 2 divisors, whose sum is σ = 20245832. Its totient is φ = 20245830.

The previous prime is 20245829. The next prime is 20245837. The reversal of 20245831 is 13854202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20245831 - 2¹ = 20245829 is a prime.

It is a super-2 number, since 2×20245831² = 819787345761122, which contains 22 as substring.

Together with 20245829, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20245796 and 20245805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20245837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122915 + 10122916.

It is an arithmetic number, because the mean of its divisors is an integer number (10122916).

Almost surely, 2^20245831 is an apocalyptic number.

20245831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245831 is an equidigital number, since it uses as much as digits as its factorization.

20245831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20245831 is about 4499.5367539337. The cubic root of 20245831 is about 272.5493825157.

The spelling of 20245831 in words is "twenty million, two hundred forty-five thousand, eight hundred thirty-one".