20631059 has 4 divisors (see below), whose sum is σ = 20788680. Its totient is φ = 20473440.

The previous prime is 20631043. The next prime is 20631097. The reversal of 20631059 is 95013602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20631059 - 2⁴ = 20631043 is a prime.

It is a super-2 number, since 2×20631059² = 851281190922962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78614 + ... + 78875.

It is an arithmetic number, because the mean of its divisors is an integer number (5197170).

Almost surely, 2^20631059 is an apocalyptic number.

20631059 is a deficient number, since it is larger than the sum of its proper divisors (157621).

20631059 is a wasteful number, since it uses less digits than its factorization.

20631059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157620.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20631059 is about 4542.1425561072. The cubic root of 20631059 is about 274.2671794917.

The spelling of 20631059 in words is "twenty million, six hundred thirty-one thousand, fifty-nine".