20525643 has 20 divisors (see below), whose sum is σ = 32277960. Its totient is φ = 12962592.

The previous prime is 20525633. The next prime is 20525653. The reversal of 20525643 is 34652502.

It is an interprime number because it is at equal distance from previous prime (20525633) and next prime (20525653).

It is not a de Polignac number, because 20525643 - 2⁵ = 20525611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

20525643 is a modest number, since divided by 5643 gives 2052 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20525623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5130 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (1613898).

Almost surely, 2^20525643 is an apocalyptic number.

20525643 is a deficient number, since it is larger than the sum of its proper divisors (11752317).

20525643 is a wasteful number, since it uses less digits than its factorization.

20525643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13368 (or 13359 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20525643 is about 4530.5234796875. The cubic root of 20525643 is about 273.7992517876.

The spelling of 20525643 in words is "twenty million, five hundred twenty-five thousand, six hundred forty-three".