20642534 has 16 divisors (see below), whose sum is σ = 33854976. Its totient is φ = 9361800.

The previous prime is 20642527. The next prime is 20642561. The reversal of 20642534 is 43524602.

It is a super-2 number, since 2×20642534² = 852228419882312, which contains 22 as substring.

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, 13139 + ... + 14625.

It is an arithmetic number, because the mean of its divisors is an integer number (2115936).

Almost surely, 2^20642534 is an apocalyptic number.

20642534 is a deficient number, since it is larger than the sum of its proper divisors (13212442).

20642534 is a wasteful number, since it uses less digits than its factorization.

20642534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20642534 is about 4543.4055509056. The cubic root of 20642534 is about 274.3180192243.

The spelling of 20642534 in words is "twenty million, six hundred forty-two thousand, five hundred thirty-four".