20702893 has 4 divisors (see below), whose sum is σ = 20718720. Its totient is φ = 20687068.

The previous prime is 20702881. The next prime is 20702911. The reversal of 20702893 is 39820702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20702893 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 (20702833) 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, 5755 + ... + 8632.

It is an arithmetic number, because the mean of its divisors is an integer number (5179680).

Almost surely, 2^20702893 is an apocalyptic number.

20702893 is the 2878-th heptagonal number.

It is an amenable number.

20702893 is a deficient number, since it is larger than the sum of its proper divisors (15827).

20702893 is a wasteful number, since it uses less digits than its factorization.

20702893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15826.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20702893 is about 4550.0431866082. The cubic root of 20702893 is about 274.5851287004.

The spelling of 20702893 in words is "twenty million, seven hundred two thousand, eight hundred ninety-three".