20425731 has 16 divisors (see below), whose sum is σ = 28047360. Its totient is φ = 13214880.

The previous prime is 20425729. The next prime is 20425759. The reversal of 20425731 is 13752402.

It is not a de Polignac number, because 20425731 - 2¹ = 20425729 is a prime.

It is a super-2 number, since 2×20425731² = 834420973768722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20425711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24225 + ... + 25053.

It is an arithmetic number, because the mean of its divisors is an integer number (1752960).

Almost surely, 2^20425731 is an apocalyptic number.

20425731 is a deficient number, since it is larger than the sum of its proper divisors (7621629).

20425731 is a wasteful number, since it uses less digits than its factorization.

20425731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20425731 is about 4519.4834881876. The cubic root of 20425731 is about 273.3542744548.

The spelling of 20425731 in words is "twenty million, four hundred twenty-five thousand, seven hundred thirty-one".