21960740 has 12 divisors (see below), whose sum is σ = 46117596. Its totient is φ = 8784288.

The previous prime is 21960727. The next prime is 21960767. The reversal of 21960740 is 4706912.

It can be written as a sum of positive squares in 2 ways, for example, as 3625216 + 18335524 = 1904^2 + 4282^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548999 + ... + 549038.

It is an arithmetic number, because the mean of its divisors is an integer number (3843133).

Almost surely, 2^21960740 is an apocalyptic number.

21960740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21960740 is an abundant number, since it is smaller than the sum of its proper divisors (24156856).

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

21960740 is a wasteful number, since it uses less digits than its factorization.

21960740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098046 (or 1098044 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21960740 is about 4686.2287609548. The cubic root of 21960740 is about 280.0371549334.

The spelling of 21960740 in words is "twenty-one million, nine hundred sixty thousand, seven hundred forty".