20401000650 has 72 divisors (see below), whose sum is σ = 54827008704. Its totient is φ = 5438647200.

The previous prime is 20401000643. The next prime is 20401000657. The reversal of 20401000650 is 5600010402.

It is a happy number.

20401000650 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 10 + 0 + 0 + 650 = 666.

It is an interprime number because it is at equal distance from previous prime (20401000643) and next prime (20401000657).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 35 ways as a sum of consecutive naturals, for example, 2825545 + ... + 2832755.

It is an arithmetic number, because the mean of its divisors is an integer number (761486232).

Almost surely, 2^20401000650 is an apocalyptic number.

20401000650 is an abundant number, since it is smaller than the sum of its proper divisors (34426008054).

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

20401000650 is a wasteful number, since it uses less digits than its factorization.

20401000650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13516 (or 13508 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The spelling of 20401000650 in words is "twenty billion, four hundred one million, six hundred fifty", and thus it is an aban number.