20400351340 has 24 divisors (see below), whose sum is σ = 42930195840. Its totient is φ = 8143100928.

The previous prime is 20400351313. The next prime is 20400351409. The reversal of 20400351340 is 4315300402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1055157 + ... + 1074316.

It is an arithmetic number, because the mean of its divisors is an integer number (1788758160).

Almost surely, 2^20400351340 is an apocalyptic number.

20400351340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400351340 is an abundant number, since it is smaller than the sum of its proper divisors (22529844500).

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

20400351340 is a wasteful number, since it uses less digits than its factorization.

20400351340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129961 (or 2129959 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 20400351340 its reverse (4315300402), we get a palindrome (24715651742).

The spelling of 20400351340 in words is "twenty billion, four hundred million, three hundred fifty-one thousand, three hundred forty".