20501047051 has 4 divisors (see below), whose sum is σ = 20506059952. Its totient is φ = 20496034152.

The previous prime is 20501047043. The next prime is 20501047117. The reversal of 20501047051 is 15074010502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15074010502 = 2 ⋅7537005251.

It is a cyclic number.

It is not a de Polignac number, because 20501047051 - 2³ = 20501047043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501047351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500311 + ... + 2508496.

It is an arithmetic number, because the mean of its divisors is an integer number (5126514988).

Almost surely, 2^20501047051 is an apocalyptic number.

20501047051 is a deficient number, since it is larger than the sum of its proper divisors (5012901).

20501047051 is an equidigital number, since it uses as much as digits as its factorization.

20501047051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5012900.

The product of its (nonzero) digits is 1400, while the sum is 25.

Adding to 20501047051 its reverse (15074010502), we get a palindrome (35575057553).

The spelling of 20501047051 in words is "twenty billion, five hundred one million, forty-seven thousand, fifty-one".