20641534 has 16 divisors (see below), whose sum is σ = 32514048. Its totient is φ = 9809272.

The previous prime is 20641529. The next prime is 20641541. The reversal of 20641534 is 43514602.

It is a junction number, because it is equal to n+sod(n) for n = 20641499 and 20641508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6339 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (2032128).

Almost surely, 2^20641534 is an apocalyptic number.

20641534 is a deficient number, since it is larger than the sum of its proper divisors (11872514).

20641534 is a wasteful number, since it uses less digits than its factorization.

20641534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20641534 is about 4543.2954999648. The cubic root of 20641534 is about 274.3135894961.

The spelling of 20641534 in words is "twenty million, six hundred forty-one thousand, five hundred thirty-four".