20900497 has 8 divisors (see below), whose sum is σ = 22548456. Its totient is φ = 19299072.

The previous prime is 20900489. The next prime is 20900527. The reversal of 20900497 is 79400902.

It can be written as a sum of positive squares in 4 ways, for example, as 2099601 + 18800896 = 1449^2 + 4336^2 .

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 20900497 - 2³ = 20900489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20900797) 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, 10698 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (2818557).

Almost surely, 2^20900497 is an apocalyptic number.

It is an amenable number.

20900497 is a deficient number, since it is larger than the sum of its proper divisors (1647959).

20900497 is a wasteful number, since it uses less digits than its factorization.

20900497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23267.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20900497 is about 4571.7061366628. The cubic root of 20900497 is about 275.4559796070.

The spelling of 20900497 in words is "twenty million, nine hundred thousand, four hundred ninety-seven".