20281797 has 24 divisors (see below), whose sum is σ = 31231200. Its totient is φ = 12646368.

The previous prime is 20281787. The next prime is 20281801. The reversal of 20281797 is 79718202.

It is not a de Polignac number, because 20281797 - 2⁶ = 20281733 is a prime.

It is a super-2 number, since 2×20281797² = 822702579098418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13479 + ... + 14907.

It is an arithmetic number, because the mean of its divisors is an integer number (1301300).

Almost surely, 2^20281797 is an apocalyptic number.

It is an amenable number.

20281797 is a deficient number, since it is larger than the sum of its proper divisors (10949403).

20281797 is a wasteful number, since it uses less digits than its factorization.

20281797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 20281797 is about 4503.5316141890. The cubic root of 20281797 is about 272.7106784752.

Adding to 20281797 its reverse (79718202), we get a palindrome (99999999).

The spelling of 20281797 in words is "twenty million, two hundred eighty-one thousand, seven hundred ninety-seven".