20897387435 has 16 divisors (see below), whose sum is σ = 26139030816. Its totient is φ = 16023287808.

The previous prime is 20897387419. The next prime is 20897387477. The reversal of 20897387435 is 53478379802.

It is a cyclic number.

It is not a de Polignac number, because 20897387435 - 2⁴ = 20897387419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830582 + ... + 855371.

It is an arithmetic number, because the mean of its divisors is an integer number (1633689426).

Almost surely, 2^20897387435 is an apocalyptic number.

20897387435 is a deficient number, since it is larger than the sum of its proper divisors (5241643381).

20897387435 is a wasteful number, since it uses less digits than its factorization.

20897387435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686062.

The product of its (nonzero) digits is 10160640, while the sum is 56.

The spelling of 20897387435 in words is "twenty billion, eight hundred ninety-seven million, three hundred eighty-seven thousand, four hundred thirty-five".