20531699 has 8 divisors (see below), whose sum is σ = 21965328. Its totient is φ = 19123200.

The previous prime is 20531689. The next prime is 20531701. The reversal of 20531699 is 99613502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20531699 - 2¹² = 20527603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531659) 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, 4577 + ... + 7874.

It is an arithmetic number, because the mean of its divisors is an integer number (2745666).

Almost surely, 2^20531699 is an apocalyptic number.

20531699 is a deficient number, since it is larger than the sum of its proper divisors (1433629).

20531699 is a wasteful number, since it uses less digits than its factorization.

20531699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 20531699 is about 4531.1917858330. The cubic root of 20531699 is about 273.8261768917.

The spelling of 20531699 in words is "twenty million, five hundred thirty-one thousand, six hundred ninety-nine".