20681475 has 24 divisors (see below), whose sum is σ = 34341552. Its totient is φ = 10982400.

The previous prime is 20681471. The next prime is 20681477. The reversal of 20681475 is 57418602.

It is not a de Polignac number, because 20681475 - 2² = 20681471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20681471) 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, 23035 + ... + 23915.

It is an arithmetic number, because the mean of its divisors is an integer number (1430898).

Almost surely, 2^20681475 is an apocalyptic number.

20681475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20681475 is a deficient number, since it is larger than the sum of its proper divisors (13660077).

20681475 is a wasteful number, since it uses less digits than its factorization.

20681475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20681475 is about 4547.6889735337. The cubic root of 20681475 is about 274.4904061332.

The spelling of 20681475 in words is "twenty million, six hundred eighty-one thousand, four hundred seventy-five".