20445797 has 8 divisors (see below), whose sum is σ = 20852832. Its totient is φ = 20041200.

The previous prime is 20445791. The next prime is 20445823. The reversal of 20445797 is 79754402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20445797 - 2⁸ = 20445541 is a prime.

It is a super-2 number, since 2×20445797² = 836061229930418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20445797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34538 + ... + 35124.

It is an arithmetic number, because the mean of its divisors is an integer number (2606604).

Almost surely, 2^20445797 is an apocalyptic number.

It is an amenable number.

20445797 is a deficient number, since it is larger than the sum of its proper divisors (407035).

20445797 is an equidigital number, since it uses as much as digits as its factorization.

20445797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 20445797 is about 4521.7028871875. The cubic root of 20445797 is about 273.4437585093.

The spelling of 20445797 in words is "twenty million, four hundred forty-five thousand, seven hundred ninety-seven".