20021766902 has 4 divisors (see below), whose sum is σ = 30032650356. Its totient is φ = 10010883450.

The previous prime is 20021766889. The next prime is 20021766913. The reversal of 20021766902 is 20966712002.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20021766902² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005441724 + ... + 5005441727.

It is an arithmetic number, because the mean of its divisors is an integer number (7508162589).

Almost surely, 2^20021766902 is an apocalyptic number.

20021766902 is a deficient number, since it is larger than the sum of its proper divisors (10010883454).

20021766902 is a wasteful number, since it uses less digits than its factorization.

20021766902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010883453.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 20021766902 in words is "twenty billion, twenty-one million, seven hundred sixty-six thousand, nine hundred two".