20780969 has 8 divisors (see below), whose sum is σ = 22727712. Its totient is φ = 18843840.

The previous prime is 20780957. The next prime is 20780999. The reversal of 20780969 is 96908702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20780969 is a prime.

It is a super-2 number, since 2×20780969² = 863697345157922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20780999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2582 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (2840964).

Almost surely, 2^20780969 is an apocalyptic number.

It is an amenable number.

20780969 is a deficient number, since it is larger than the sum of its proper divisors (1946743).

20780969 is a wasteful number, since it uses less digits than its factorization.

20780969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4807.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20780969 is about 4558.6148115409. The cubic root of 20780969 is about 274.9298730277.

The spelling of 20780969 in words is "twenty million, seven hundred eighty thousand, nine hundred sixty-nine".