20791797 has 16 divisors (see below), whose sum is σ = 30585408. Its totient is φ = 12481920.

The previous prime is 20791783. The next prime is 20791801. The reversal of 20791797 is 79719702.

It is not a de Polignac number, because 20791797 - 2⁴ = 20791781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791717) 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, 4903 + ... + 8100.

It is an arithmetic number, because the mean of its divisors is an integer number (1911588).

Almost surely, 2^20791797 is an apocalyptic number.

It is an amenable number.

20791797 is a deficient number, since it is larger than the sum of its proper divisors (9793611).

20791797 is a wasteful number, since it uses less digits than its factorization.

20791797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13060.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 20791797 is about 4559.8022983458. The cubic root of 20791797 is about 274.9776158089.

The spelling of 20791797 in words is "twenty million, seven hundred ninety-one thousand, seven hundred ninety-seven".