20577631 has 2 divisors, whose sum is σ = 20577632. Its totient is φ = 20577630.

The previous prime is 20577629. The next prime is 20577637. The reversal of 20577631 is 13677502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20577631 - 2¹ = 20577629 is a prime.

It is a super-2 number, since 2×20577631² = 846877795144322, which contains 22 as substring.

Together with 20577629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20577593 and 20577602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20577637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288815 + 10288816.

It is an arithmetic number, because the mean of its divisors is an integer number (10288816).

Almost surely, 2^20577631 is an apocalyptic number.

20577631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20577631 is an equidigital number, since it uses as much as digits as its factorization.

20577631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 20577631 is about 4536.2573780596. The cubic root of 20577631 is about 274.0302193746.

The spelling of 20577631 in words is "twenty million, five hundred seventy-seven thousand, six hundred thirty-one".