20695978040 has 32 divisors (see below), whose sum is σ = 46570459680. Its totient is φ = 8277589632.

The previous prime is 20695978001. The next prime is 20695978081. The reversal of 20695978040 is 4087959602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20695978040.

It is a congruent number.

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, 564509 + ... + 600051.

It is an arithmetic number, because the mean of its divisors is an integer number (1455326865).

Almost surely, 2^20695978040 is an apocalyptic number.

20695978040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20695978040 is an abundant number, since it is smaller than the sum of its proper divisors (25874481640).

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

20695978040 is a wasteful number, since it uses less digits than its factorization.

20695978040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50111 (or 50107 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 20695978040 in words is "twenty billion, six hundred ninety-five million, nine hundred seventy-eight thousand, forty".