20899143485 has 16 divisors (see below), whose sum is σ = 27473368320. Its totient is φ = 15135771840.

The previous prime is 20899143481. The next prime is 20899143527. The reversal of 20899143485 is 58434199802.

It is not a de Polignac number, because 20899143485 - 2² = 20899143481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899143481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781802 + ... + 808091.

It is an arithmetic number, because the mean of its divisors is an integer number (1717085520).

Almost surely, 2^20899143485 is an apocalyptic number.

It is an amenable number.

20899143485 is a deficient number, since it is larger than the sum of its proper divisors (6574224835).

20899143485 is a wasteful number, since it uses less digits than its factorization.

20899143485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590148.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 20899143485 in words is "twenty billion, eight hundred ninety-nine million, one hundred forty-three thousand, four hundred eighty-five".