20690715 has 24 divisors (see below), whose sum is σ = 34948368. Its totient is φ = 10451520.

The previous prime is 20690701. The next prime is 20690737. The reversal of 20690715 is 51709602.

It is not a de Polignac number, because 20690715 - 2¹¹ = 20688667 is a prime.

It is a super-2 number, since 2×20690715² = 856211374422450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3505 + ... + 7325.

It is an arithmetic number, because the mean of its divisors is an integer number (1456182).

Almost surely, 2^20690715 is an apocalyptic number.

20690715 is a deficient number, since it is larger than the sum of its proper divisors (14257653).

20690715 is a wasteful number, since it uses less digits than its factorization.

20690715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867 (or 3848 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 20690715 is about 4548.7047606984. The cubic root of 20690715 is about 274.5312786810.

The spelling of 20690715 in words is "twenty million, six hundred ninety thousand, seven hundred fifteen".