20642427213 has 16 divisors (see below), whose sum is σ = 28464660480. Its totient is φ = 13298319216.

The previous prime is 20642427209. The next prime is 20642427217. The reversal of 20642427213 is 31272424602.

It is an interprime number because it is at equal distance from previous prime (20642427209) and next prime (20642427217).

It is not a de Polignac number, because 20642427213 - 2² = 20642427209 is a prime.

It is a super-2 number, since 2×20642427213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642427217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915445 + ... + 937722.

It is an arithmetic number, because the mean of its divisors is an integer number (1779041280).

Almost surely, 2^20642427213 is an apocalyptic number.

It is an amenable number.

20642427213 is a deficient number, since it is larger than the sum of its proper divisors (7822233267).

20642427213 is a wasteful number, since it uses less digits than its factorization.

20642427213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853296.

The product of its (nonzero) digits is 32256, while the sum is 33.

The spelling of 20642427213 in words is "twenty billion, six hundred forty-two million, four hundred twenty-seven thousand, two hundred thirteen".