20894154157 has 2 divisors, whose sum is σ = 20894154158. Its totient is φ = 20894154156.

The previous prime is 20894154143. The next prime is 20894154179. The reversal of 20894154157 is 75145149802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20795370436 + 98783721 = 144206^2 + 9939^2 .

It is a cyclic number.

It is not a de Polignac number, because 20894154157 - 2¹¹ = 20894152109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20894157157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10447077078 + 10447077079.

It is an arithmetic number, because the mean of its divisors is an integer number (10447077079).

Almost surely, 2^20894154157 is an apocalyptic number.

It is an amenable number.

20894154157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20894154157 is an equidigital number, since it uses as much as digits as its factorization.

20894154157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 20894154157 in words is "twenty billion, eight hundred ninety-four million, one hundred fifty-four thousand, one hundred fifty-seven".