20774399 has 4 divisors (see below), whose sum is σ = 20793600. Its totient is φ = 20755200.

The previous prime is 20774381. The next prime is 20774401. The reversal of 20774399 is 99347702.

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

It is a cyclic number.

It is not a de Polignac number, because 20774399 - 2¹² = 20770303 is a prime.

It is a super-2 number, since 2×20774399² = 863151307622402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20774899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7874 + ... + 10175.

It is an arithmetic number, because the mean of its divisors is an integer number (5198400).

Almost surely, 2^20774399 is an apocalyptic number.

20774399 is a deficient number, since it is larger than the sum of its proper divisors (19201).

20774399 is a wasteful number, since it uses less digits than its factorization.

20774399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19200.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20774399 is about 4557.8941409383. The cubic root of 20774399 is about 274.9008965212.

The spelling of 20774399 in words is "twenty million, seven hundred seventy-four thousand, three hundred ninety-nine".