20607861 has 16 divisors (see below), whose sum is σ = 28166400. Its totient is φ = 13398528.

The previous prime is 20607857. The next prime is 20607863. The reversal of 20607861 is 16870602.

It is a happy number.

It is not a de Polignac number, because 20607861 - 2² = 20607857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20607863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20605 + ... + 21581.

It is an arithmetic number, because the mean of its divisors is an integer number (1760400).

Almost surely, 2^20607861 is an apocalyptic number.

It is an amenable number.

20607861 is a deficient number, since it is larger than the sum of its proper divisors (7558539).

20607861 is an equidigital number, since it uses as much as digits as its factorization.

20607861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20607861 is about 4539.5881971826. The cubic root of 20607861 is about 274.1643436620.

The spelling of 20607861 in words is "twenty million, six hundred seven thousand, eight hundred sixty-one".