20428408031 has 2 divisors, whose sum is σ = 20428408032. Its totient is φ = 20428408030.

The previous prime is 20428407991. The next prime is 20428408123. The reversal of 20428408031 is 13080482402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20428408031 is a prime.

It is a super-4 number, since 4×20428408031⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20428408531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214204015 + 10214204016.

It is an arithmetic number, because the mean of its divisors is an integer number (10214204016).

Almost surely, 2^20428408031 is an apocalyptic number.

20428408031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20428408031 is an equidigital number, since it uses as much as digits as its factorization.

20428408031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 32.

The spelling of 20428408031 in words is "twenty billion, four hundred twenty-eight million, four hundred eight thousand, thirty-one".