20654457437 has 2 divisors, whose sum is σ = 20654457438. Its totient is φ = 20654457436.

The previous prime is 20654457419. The next prime is 20654457457. The reversal of 20654457437 is 73475445602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18816706276 + 1837751161 = 137174^2 + 42869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20654457437 - 2⁸ = 20654457181 is a prime.

It is a super-2 number, since 2×20654457437² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20654457391 and 20654457400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20654457457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327228718 + 10327228719.

It is an arithmetic number, because the mean of its divisors is an integer number (10327228719).

Almost surely, 2^20654457437 is an apocalyptic number.

It is an amenable number.

20654457437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20654457437 is an equidigital number, since it uses as much as digits as its factorization.

20654457437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 47.

The spelling of 20654457437 in words is "twenty billion, six hundred fifty-four million, four hundred fifty-seven thousand, four hundred thirty-seven".