20628139723 has 2 divisors, whose sum is σ = 20628139724. Its totient is φ = 20628139722.

The previous prime is 20628139681. The next prime is 20628139757. The reversal of 20628139723 is 32793182602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20628139723 - 2²⁹ = 20091268811 is a prime.

It is a super-3 number, since 3×20628139723³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20628139723.

It is not a weakly prime, because it can be changed into another prime (20628139123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314069861 + 10314069862.

It is an arithmetic number, because the mean of its divisors is an integer number (10314069862).

Almost surely, 2^20628139723 is an apocalyptic number.

20628139723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628139723 is an equidigital number, since it uses as much as digits as its factorization.

20628139723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 20628139723 in words is "twenty billion, six hundred twenty-eight million, one hundred thirty-nine thousand, seven hundred twenty-three".