20901739 has 4 divisors (see below), whose sum is σ = 21136680. Its totient is φ = 20666800.

The previous prime is 20901737. The next prime is 20901743. The reversal of 20901739 is 93710902.

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 20901739 - 2¹ = 20901737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20901739.

It is not an unprimeable number, because it can be changed into a prime (20901737) 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, 117337 + ... + 117514.

It is an arithmetic number, because the mean of its divisors is an integer number (5284170).

Almost surely, 2^20901739 is an apocalyptic number.

20901739 is a deficient number, since it is larger than the sum of its proper divisors (234941).

20901739 is an equidigital number, since it uses as much as digits as its factorization.

20901739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234940.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20901739 is about 4571.8419701473. The cubic root of 20901739 is about 275.4614357699.

The spelling of 20901739 in words is "twenty million, nine hundred one thousand, seven hundred thirty-nine".