20405662 has 4 divisors (see below), whose sum is σ = 30608496. Its totient is φ = 10202830.

The previous prime is 20405641. The next prime is 20405663. The reversal of 20405662 is 26650402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101414 + ... + 5101417.

It is an arithmetic number, because the mean of its divisors is an integer number (7652124).

Almost surely, 2^20405662 is an apocalyptic number.

20405662 is a deficient number, since it is larger than the sum of its proper divisors (10202834).

20405662 is a wasteful number, since it uses less digits than its factorization.

20405662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10202833.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20405662 is about 4517.2626667043. The cubic root of 20405662 is about 273.2647183841.

The spelling of 20405662 in words is "twenty million, four hundred five thousand, six hundred sixty-two".