20488931 has 2 divisors, whose sum is σ = 20488932. Its totient is φ = 20488930.

The previous prime is 20488921. The next prime is 20488933. The reversal of 20488931 is 13988402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20488931 is a prime.

It is a super-2 number, since 2×20488931² = 839592587045522, which contains 22 as substring.

Together with 20488933, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20488891 and 20488900.

It is not a weakly prime, because it can be changed into another prime (20488933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10244465 + 10244466.

It is an arithmetic number, because the mean of its divisors is an integer number (10244466).

Almost surely, 2^20488931 is an apocalyptic number.

20488931 is the 2420-th centered heptagonal number.

20488931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20488931 is an equidigital number, since it uses as much as digits as its factorization.

20488931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20488931 is about 4526.4700374574. The cubic root of 20488931 is about 273.6359159886.

The spelling of 20488931 in words is "twenty million, four hundred eighty-eight thousand, nine hundred thirty-one".