20987198224 has 40 divisors (see below), whose sum is σ = 43538429880. Its totient is φ = 9765347328.

The previous prime is 20987198191. The next prime is 20987198257. The reversal of 20987198224 is 42289178902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20987198191) and next prime (20987198257).

It can be written as a sum of positive squares in 4 ways, for example, as 4413210624 + 16573987600 = 66432^2 + 128740^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409269 + ... + 457684.

It is an arithmetic number, because the mean of its divisors is an integer number (1088460747).

Almost surely, 2^20987198224 is an apocalyptic number.

It is an amenable number.

20987198224 is an abundant number, since it is smaller than the sum of its proper divisors (22551231656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20987198224 is a wasteful number, since it uses less digits than its factorization.

20987198224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867067 (or 867061 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 20987198224 in words is "twenty billion, nine hundred eighty-seven million, one hundred ninety-eight thousand, two hundred twenty-four".