20612985 has 32 divisors (see below), whose sum is σ = 34470912. Its totient is φ = 10506240.

The previous prime is 20612957. The next prime is 20613029. The reversal of 20612985 is 58921602.

It is not a de Polignac number, because 20612985 - 2¹⁷ = 20481913 is a prime.

It is a super-2 number, since 2×20612985² = 849790301220450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44877 + ... + 45333.

It is an arithmetic number, because the mean of its divisors is an integer number (1077216).

Almost surely, 2^20612985 is an apocalyptic number.

It is an amenable number.

20612985 is a deficient number, since it is larger than the sum of its proper divisors (13857927).

20612985 is a wasteful number, since it uses less digits than its factorization.

20612985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20612985 is about 4540.1525304774. The cubic root of 20612985 is about 274.1870647922.

The spelling of 20612985 in words is "twenty million, six hundred twelve thousand, nine hundred eighty-five".