20678553 has 24 divisors (see below), whose sum is σ = 34265088. Its totient is φ = 11771712.

The previous prime is 20678549. The next prime is 20678561. The reversal of 20678553 is 35587602.

It is not a de Polignac number, because 20678553 - 2² = 20678549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20678513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23701 + ... + 24557.

It is an arithmetic number, because the mean of its divisors is an integer number (1427712).

Almost surely, 2^20678553 is an apocalyptic number.

It is an amenable number.

20678553 is a deficient number, since it is larger than the sum of its proper divisors (13586535).

20678553 is a wasteful number, since it uses less digits than its factorization.

20678553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20678553 is about 4547.3677001096. The cubic root of 20678553 is about 274.4774783198.

The spelling of 20678553 in words is "twenty million, six hundred seventy-eight thousand, five hundred fifty-three".