20537797 has 4 divisors (see below), whose sum is σ = 23471776. Its totient is φ = 17603820.

The previous prime is 20537773. The next prime is 20537813. The reversal of 20537797 is 79773502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20537797 - 2⁷ = 20537669 is a prime.

It is a super-2 number, since 2×20537797² = 843602211226418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20537707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1466979 + ... + 1466992.

It is an arithmetic number, because the mean of its divisors is an integer number (5867944).

Almost surely, 2^20537797 is an apocalyptic number.

It is an amenable number.

20537797 is a deficient number, since it is larger than the sum of its proper divisors (2933979).

20537797 is an equidigital number, since it uses as much as digits as its factorization.

20537797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933978.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 20537797 is about 4531.8646272809. The cubic root of 20537797 is about 273.8532833794.

The spelling of 20537797 in words is "twenty million, five hundred thirty-seven thousand, seven hundred ninety-seven".