20402225501 has 16 divisors (see below), whose sum is σ = 24093888000. Its totient is φ = 17266236624.

The previous prime is 20402225491. The next prime is 20402225513. The reversal of 20402225501 is 10552220402.

It is not a de Polignac number, because 20402225501 - 2¹⁴ = 20402209117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402225581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349370 + ... + 403563.

It is an arithmetic number, because the mean of its divisors is an integer number (1505868000).

Almost surely, 2^20402225501 is an apocalyptic number.

It is an amenable number.

20402225501 is a deficient number, since it is larger than the sum of its proper divisors (3691662499).

20402225501 is an frugal number, since it uses more digits than its factorization.

20402225501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753033 (or 753019 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 20402225501 its reverse (10552220402), we get a palindrome (30954445903).

The spelling of 20402225501 in words is "twenty billion, four hundred two million, two hundred twenty-five thousand, five hundred one".