20401235577 has 48 divisors (see below), whose sum is σ = 32313048768. Its totient is φ = 12352112640.

The previous prime is 20401235483. The next prime is 20401235593. The reversal of 20401235577 is 77553210402.

20401235577 is a `hidden beast` number, since 2 + 0 + 40 + 12 + 35 + 577 = 666.

It is not a de Polignac number, because 20401235577 - 2¹² = 20401231481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20401235597) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 527377 + ... + 564737.

It is an arithmetic number, because the mean of its divisors is an integer number (673188516).

Almost surely, 2^20401235577 is an apocalyptic number.

It is an amenable number.

20401235577 is a deficient number, since it is larger than the sum of its proper divisors (11911813191).

20401235577 is a wasteful number, since it uses less digits than its factorization.

20401235577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37510 (or 37507 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

Adding to 20401235577 its reverse (77553210402), we get a palindrome (97954445979).

The spelling of 20401235577 in words is "twenty billion, four hundred one million, two hundred thirty-five thousand, five hundred seventy-seven".