20956080 has 40 divisors (see below), whose sum is σ = 64964592. Its totient is φ = 5588224.

The previous prime is 20956073. The next prime is 20956081. The reversal of 20956080 is 8065902.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20956081) 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, 43419 + ... + 43898.

Almost surely, 2^20956080 is an apocalyptic number.

20956080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20956080 is an abundant number, since it is smaller than the sum of its proper divisors (44008512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20956080 is a wasteful number, since it uses less digits than its factorization.

20956080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87333 (or 87327 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20956080 is about 4577.7811218974. The cubic root of 20956080 is about 275.6999469678.

The spelling of 20956080 in words is "twenty million, nine hundred fifty-six thousand, eighty".