21690762 has 32 divisors (see below), whose sum is σ = 45049344. Its totient is φ = 6955200.

The previous prime is 21690743. The next prime is 21690787. The reversal of 21690762 is 26709612.

It is a super-2 number, since 2×21690762² = 940978312281288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51312 + ... + 51732.

It is an arithmetic number, because the mean of its divisors is an integer number (1407792).

Almost surely, 2^21690762 is an apocalyptic number.

21690762 is an abundant number, since it is smaller than the sum of its proper divisors (23358582).

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

21690762 is a wasteful number, since it uses less digits than its factorization.

21690762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21690762 is about 4657.3342160511. The cubic root of 21690762 is about 278.8848589005.

The spelling of 21690762 in words is "twenty-one million, six hundred ninety thousand, seven hundred sixty-two".