20981424285 has 24 divisors (see below), whose sum is σ = 36410010624. Its totient is φ = 11177105760.

The previous prime is 20981424241. The next prime is 20981424353. The reversal of 20981424285 is 58242418902.

20981424285 is a `hidden beast` number, since 209 + 8 + 14 + 2 + 428 + 5 = 666.

It is not a de Polignac number, because 20981424285 - 2⁹ = 20981423773 is a prime.

It is a super-2 number, since 2×20981424285² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20981424285.

It is a congruent number.

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, 231301 + ... + 308970.

It is an arithmetic number, because the mean of its divisors is an integer number (1517083776).

Almost surely, 2^20981424285 is an apocalyptic number.

It is an amenable number.

20981424285 is a deficient number, since it is larger than the sum of its proper divisors (15428586339).

20981424285 is a wasteful number, since it uses less digits than its factorization.

20981424285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541145 (or 541142 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 20981424285 in words is "twenty billion, nine hundred eighty-one million, four hundred twenty-four thousand, two hundred eighty-five".