20731534 has 8 divisors (see below), whose sum is σ = 32926608. Its totient is φ = 9756000.

The previous prime is 20731499. The next prime is 20731553. The reversal of 20731534 is 43513702.

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

It is a junction number, because it is equal to n+sod(n) for n = 20731499 and 20731508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304842 + ... + 304909.

It is an arithmetic number, because the mean of its divisors is an integer number (4115826).

Almost surely, 2^20731534 is an apocalyptic number.

20731534 is a deficient number, since it is larger than the sum of its proper divisors (12195074).

20731534 is a wasteful number, since it uses less digits than its factorization.

20731534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609770.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20731534 is about 4553.1894315963. The cubic root of 20731534 is about 274.7116934409.

The spelling of 20731534 in words is "twenty million, seven hundred thirty-one thousand, five hundred thirty-four".