20040420187 has 2 divisors, whose sum is σ = 20040420188. Its totient is φ = 20040420186.

The previous prime is 20040420181. The next prime is 20040420203. The reversal of 20040420187 is 78102404002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20040420187 is a prime.

It is a super-2 number, since 2×20040420187² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20040420181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020210093 + 10020210094.

It is an arithmetic number, because the mean of its divisors is an integer number (10020210094).

Almost surely, 2^20040420187 is an apocalyptic number.

20040420187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20040420187 is an equidigital number, since it uses as much as digits as its factorization.

20040420187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 28.

Adding to 20040420187 its reverse (78102404002), we get a palindrome (98142824189).

The spelling of 20040420187 in words is "twenty billion, forty million, four hundred twenty thousand, one hundred eighty-seven".