20543631 has 8 divisors (see below), whose sum is σ = 27461424. Its totient is φ = 13660800.

The previous prime is 20543609. The next prime is 20543639. The reversal of 20543631 is 13634502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20543631 - 2⁹ = 20543119 is a prime.

It is a super-2 number, since 2×20543631² = 844081549328322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7336 + ... + 9741.

It is an arithmetic number, because the mean of its divisors is an integer number (3432678).

Almost surely, 2^20543631 is an apocalyptic number.

20543631 is a deficient number, since it is larger than the sum of its proper divisors (6917793).

20543631 is a wasteful number, since it uses less digits than its factorization.

20543631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17481.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20543631 is about 4532.5082459936. The cubic root of 20543631 is about 273.8792113275.

The spelling of 20543631 in words is "twenty million, five hundred forty-three thousand, six hundred thirty-one".