20262639 has 4 divisors (see below), whose sum is σ = 27016856. Its totient is φ = 13508424.

The previous prime is 20262637. The next prime is 20262647. The reversal of 20262639 is 93626202.

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

It is not a de Polignac number, because 20262639 - 2¹ = 20262637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20262637) 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, 3377104 + ... + 3377109.

It is an arithmetic number, because the mean of its divisors is an integer number (6754214).

Almost surely, 2^20262639 is an apocalyptic number.

20262639 is a deficient number, since it is larger than the sum of its proper divisors (6754217).

20262639 is an equidigital number, since it uses as much as digits as its factorization.

20262639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6754216.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20262639 is about 4501.4041142737. The cubic root of 20262639 is about 272.6247847536.

The spelling of 20262639 in words is "twenty million, two hundred sixty-two thousand, six hundred thirty-nine".