20401000651 has 4 divisors (see below), whose sum is σ = 20401318872. Its totient is φ = 20400682432.

The previous prime is 20401000643. The next prime is 20401000657. The reversal of 20401000651 is 15600010402.

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

It is a cyclic number.

It is not a de Polignac number, because 20401000651 - 2³ = 20401000643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401000657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25606 + ... + 203611.

It is an arithmetic number, because the mean of its divisors is an integer number (5100329718).

Almost surely, 2^20401000651 is an apocalyptic number.

20401000651 is a deficient number, since it is larger than the sum of its proper divisors (318221).

20401000651 is an equidigital number, since it uses as much as digits as its factorization.

20401000651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318220.

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 20401000651 in words is "twenty billion, four hundred one million, six hundred fifty-one", and thus it is an aban number.