20535697 has 12 divisors (see below), whose sum is σ = 25415040. Its totient is φ = 16247088.

The previous prime is 20535689. The next prime is 20535707. The reversal of 20535697 is 79653502.

It is not a de Polignac number, because 20535697 - 2³ = 20535689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7497 + ... + 9862.

It is an arithmetic number, because the mean of its divisors is an integer number (2117920).

Almost surely, 2^20535697 is an apocalyptic number.

It is an amenable number.

20535697 is a deficient number, since it is larger than the sum of its proper divisors (4879343).

20535697 is a wasteful number, since it uses less digits than its factorization.

20535697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17392 (or 17379 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 20535697 is about 4531.6329286472. The cubic root of 20535697 is about 273.8439491829.

It can be divided in two parts, 2053 and 5697, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 20535697 in words is "twenty million, five hundred thirty-five thousand, six hundred ninety-seven".