20049881 has 2 divisors, whose sum is σ = 20049882. Its totient is φ = 20049880.

The previous prime is 20049833. The next prime is 20049889. The reversal of 20049881 is 18894002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17505856 + 2544025 = 4184^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20049881 - 2¹⁸ = 19787737 is a prime.

It is a super-2 number, since 2×20049881² = 803995456228322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20049889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10024940 + 10024941.

It is an arithmetic number, because the mean of its divisors is an integer number (10024941).

Almost surely, 2^20049881 is an apocalyptic number.

It is an amenable number.

20049881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20049881 is an equidigital number, since it uses as much as digits as its factorization.

20049881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20049881 is about 4477.7093474231. The cubic root of 20049881 is about 271.6672374225.

The spelling of 20049881 in words is "twenty million, forty-nine thousand, eight hundred eighty-one".