20621774 has 4 divisors (see below), whose sum is σ = 30932664. Its totient is φ = 10310886.

The previous prime is 20621771. The next prime is 20621791. The reversal of 20621774 is 47712602.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5155442 + ... + 5155445.

It is an arithmetic number, because the mean of its divisors is an integer number (7733166).

Almost surely, 2^20621774 is an apocalyptic number.

20621774 is a deficient number, since it is larger than the sum of its proper divisors (10310890).

20621774 is a wasteful number, since it uses less digits than its factorization.

20621774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310889.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20621774 is about 4541.1203463463. The cubic root of 20621774 is about 274.2260287056.

The spelling of 20621774 in words is "twenty million, six hundred twenty-one thousand, seven hundred seventy-four".