20699690 has 16 divisors (see below), whose sum is σ = 40646880. Its totient is φ = 7527120.

The previous prime is 20699671. The next prime is 20699713. The reversal of 20699690 is 9699602.

It is a happy number.

It is a super-2 number, since 2×20699690² = 856954332192200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93980 + ... + 94199.

It is an arithmetic number, because the mean of its divisors is an integer number (2540430).

Almost surely, 2^20699690 is an apocalyptic number.

20699690 is a deficient number, since it is larger than the sum of its proper divisors (19947190).

20699690 is a wasteful number, since it uses less digits than its factorization.

20699690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188197.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 20699690 is about 4549.6911983123. The cubic root of 20699690 is about 274.5709673699.

The spelling of 20699690 in words is "twenty million, six hundred ninety-nine thousand, six hundred ninety".