20956790 has 8 divisors (see below), whose sum is σ = 37722240. Its totient is φ = 8382712.

The previous prime is 20956787. The next prime is 20956799. The reversal of 20956790 is 9765902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20956799) 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, 1047830 + ... + 1047849.

It is an arithmetic number, because the mean of its divisors is an integer number (4715280).

Almost surely, 2^20956790 is an apocalyptic number.

20956790 is a deficient number, since it is larger than the sum of its proper divisors (16765450).

20956790 is a wasteful number, since it uses less digits than its factorization.

20956790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095686.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 20956790 is about 4577.8586697276. The cubic root of 20956790 is about 275.7030605392.

The spelling of 20956790 in words is "twenty million, nine hundred fifty-six thousand, seven hundred ninety".