20743955 has 4 divisors (see below), whose sum is σ = 24892752. Its totient is φ = 16595160.

The previous prime is 20743949. The next prime is 20743973. The reversal of 20743955 is 55934702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55934702 = 2 ⋅27967351.

It is a de Polignac number, because none of the positive numbers 2^k-20743955 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074391 + ... + 2074400.

It is an arithmetic number, because the mean of its divisors is an integer number (6223188).

Almost surely, 2^20743955 is an apocalyptic number.

20743955 is a deficient number, since it is larger than the sum of its proper divisors (4148797).

20743955 is an equidigital number, since it uses as much as digits as its factorization.

20743955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148796.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 20743955 is about 4554.5532162881. The cubic root of 20743955 is about 274.7665456726.

The spelling of 20743955 in words is "twenty million, seven hundred forty-three thousand, nine hundred fifty-five".