20823651428 has 6 divisors (see below), whose sum is σ = 36441390006. Its totient is φ = 10411825712.

The previous prime is 20823651377. The next prime is 20823651439. The reversal of 20823651428 is 82415632802.

It can be written as a sum of positive squares in only one way, i.e., 10857223204 + 9966428224 = 104198^2 + 99832^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602956425 + ... + 2602956432.

It is an arithmetic number, because the mean of its divisors is an integer number (6073565001).

Almost surely, 2^20823651428 is an apocalyptic number.

It is an amenable number.

20823651428 is a deficient number, since it is larger than the sum of its proper divisors (15617738578).

20823651428 is a wasteful number, since it uses less digits than its factorization.

20823651428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205912861 (or 5205912859 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 20823651428 in words is "twenty billion, eight hundred twenty-three million, six hundred fifty-one thousand, four hundred twenty-eight".